[Sony Ericsson XPERIA X10 Mini] dettofatto:
If you phone can't boot or bricked, here you can find some suggestions:

http://xdaforums.com/showthread.php?p=10249635#post10249635

http://xdaforums.com/showthread.php?t=749438

Many people backup using this app but when they switch to custom roms they can't restore their backups. But now that's very much possible...here's the link

Http://xdaforums.com/showthread.php?t=982051

Wiki: http://xdaforums.com/wiki/index.php?title=Xperia_X10_Mini

[size=+2]New![/size]

ROMs and ported ROMs :

miniCM7- gingerbread rom for x10mini :
[url]http://xdaforums.com/showthread.php?t=1068553[/url]

gingerDX ported from X8 for X10mini :
[url]http://xdaforums.com/showthread.php?t=1200675[/url]

Sonybread by paul-xxx (X10mini!):
[url]http://xdaforums.com/showthread.php?t=1244627[/url]

clipped stock eclair (x10mini):
[url]http://xdaforums.com/showthread.php?t=1218568[/url]
i'll add more links soon

stock eclair rooted (x10mini):
[url]http://xdaforums.com/showthread.php?p=16800433#post16800433[/url]

KERNELS :

unlock-relock boot loader (X10mini, X8, X10mini pro) :
[url]http://xdaforums.com/showthread.php?t=1254225[/url]
[url]http://xdaforums.com/showpost.php?p=17448717&postcount=5[/url]

nAa's custom kernel for gingerbread (x10mini) :
[url]http://xdaforums.com/showthread.php?t=1256739[/url]

azuzu custom kernel (2.1) for x10mini:
[url]http://xdaforums.com/showthread.php?t=1253787[/url]

STOCK kernel (provided by azuzu) :
[url]http://api.viglink.com/api/click?format=go&drKey=1359&loc=http%3A%2F%2Fxdaforums.com%2Fshowthread.php%3Ft%3D1253787&v=1&libid=1317571552578&out=http%3A%2F%2Fdl.dropbox.com%2Fu%2F10158456%2FAndroid%2FX10%2520Mini%2520Kernels%2FKernels%2FSony-Ericsson_Stock_Kernel.ftf&ref=http%3A%2F%2Fxdaforums.com%2Fshowthread.php%3Ft%3D1256969%26page%3D3&title=aZuZu%20dKernel%2C%20v0.3%20-%20Custom%20kernel%20for%20freeBootLoader%20by%20laser%20-%20xda-developers&txt=Stock%20Sony-Ericsson%20kernel%20-%20Version%3A%202.1.1.C.0.0&jsonp=vglnk_jsonp_13175715589073[/url]
development gingerbread/cyanogen rom (x10mini):
[url]http://xdaforums.com/showthread.php?t==1211648[/url]

FAQs, and others :

FAQ for miniCM7, nAa kernel, and much more for x10mini (and pro sometimes) :
[url]http://xdaforums.com/showthread.php?t=1266911[/url]

useful links and more (x10mini) :
[url]http://xdaforums.com/showpost.php?p=17651751&postcount=3[/url]

[size=+2]2.1 Mini & Pro (2.1.1.A.0.6 & 2.0.2.A.0.24 & 2.0.A.0.504):[/size]

Root on X10 mini & Pro 2.1 :
[url]http://xdaforums.com/showthread.php?t=803682[/url]
[url]http://xdaforums.com/showthread.php?t=906742[/url]
[url]http://xdaforums.com/showthread.php?t=906231[/url]

Nordic Generic Firmware 2.0.2.A.0.24 that's Pre-Rooted and with Xrecovery is available:
Pro: [url]http://xdaforums.com/showthread.php?t=895370[/url]
Mini: [url]http://xdaforums.com/showthread.php?t=894918[/url]

If you have updated, but you can't root, you can dowgrade:
Pro: [url]http://xdaforums.com/showthread.php?t=826455[/url]
Mini: [url]http://xdaforums.com/showthread.php?t=825664[/url]

Root on X10 mini & Pro 2.1:
[url]http://xdaforums.com/showthread.php?t=838393[/url]

App2sd X10 Mini & Pro 1.6 & 2.1:
[url]http://xdaforums.com/showthread.php?t=804574[/url]
For recover your files on ext2 or ext3 I suggest to use ubuntu live cd...

Link2sd:
[url]http://xdaforums.com/showthread.php?t=919326[/url]

XXXX App and Paypal issues after installing APP2SD....:
[url]http://xdaforums.com/showthread.php?t=888596[/url]

Market QVGA fix for X10 mini & Pro 2.1 & 1.6:
[url]http://xdaforums.com/showthread.php?t=742608[/url]

New Market Dec 2010:
[url]http://xdaforums.com/showthread.php?t=841001[/url]

Photo album for 2.1:
[url]http://xdaforums.com/showthread.php?t=835328[/url]
[url]http://xdaforums.com/showthread.php?t=834660[/url]
[url]http://xdaforums.com/showthread.php?t=890527[/url]

Flash Tool for X10 mini pro (to 1.6 > 2.1):
[url]http://xdaforums.com/showthread.php?t=826455[/url]

Flash Tool for X10 mini:
[url]http://xdaforums.com/showthread.php?t=825664[/url]

Tether WiFi 1.6 & 2.1 X10 Mini & Pro:
[url]http://xdaforums.com/showthread.php?t=740698[/url]

Removing Apps from X10Mini/Pro:
[url]http://xdaforums.com/showthread.php?t=740338[/url]
[url]http://xdaforums.com/showthread.php?t=833722[/url]

Or Freeze every unused applications:
[url]http://xdaforums.com/showthread.php?t=838526[/url]

Original 2.1 system/app:
[url]http://xdaforums.com/showthread.php?t=835311[/url]

Expose-app (post 114):
[url]http://xdaforums.com/showthread.php?t=740338&page=12[/url]

Keyboards:
X10 Mini: [url]http://xdaforums.com/showthread.php?t=794736[/url]
[url]http://xdaforums.com/showthread.php?t=899755[/url]

Wirless n on X10 Mini & Pro
[url]http://xdaforums.com/showthread.php?t=833930[/url]

JIT Overclock
[url]http://xdaforums.com/showthread.php?t=828929[/url]

CPU Scaling:
[url]http://xdaforums.com/showthread.php?t=791940[/url]
setcpu is free here for XDA members (thanks to coolbho3000): [url]http://xdaforums.com/showthread.php?

t=505419[/url]

Disable default Lock screen 2.1 & 1.6:
[url]http://xdaforums.com/showthread.php?t=842717[/url]

Java Box:
[url]http://xdaforums.com/showthread.php?t=845681[/url]

Replacing the stock calendar app with default android calendar
[url]http://xdaforums.com/showthread.php?t=850830[/url]

xRecovery:
[url]http://xdaforums.com/showthread.php?t=878427[/url]

script to install xrecovery, bootanimation, reboot on power menu and jit
[url]http://xdaforums.com/showthread.php?t=888250[/url]

[size=+2]1.6 Mini & Pro:[/size]

Root on x10 mini & Pro 1.6:
[url]http://xdaforums.com/showthread.php?t=739874[/url]

App2sd X10 Mini & Pro 1.6 & 2.1:
[url]http://xdaforums.com/showthread.php?t=804574[/url]
For recover your files on ext2 or ext3 I suggest to use ubuntu live cd...

Market QVGA fix for X10 mini & Pro 2.1 & 1.6:
[url]http://xdaforums.com/showthread.php?t=742608[/url]

Flash Tool for X10 mini pro (to 1.6 > 2.1):
[url]http://xdaforums.com/showthread.php?t=826455[/url]

Flash Tool for X10 mini:
[url]http://xdaforums.com/showthread.php?t=825664[/url]

Tether WiFi 1.6 & 2.1 X10 Mini & Pro:
[url]http://xdaforums.com/showthread.php?t=740698[/url]

Removing Apps from X10Mini/Pro:
[url]http://xdaforums.com/showthread.php?t=740338[/url]
[url]http://xdaforums.com/showthread.php?t=833722[/url]

Or Freeze every unused applications:
[url]http://xdaforums.com/showthread.php?t=838526[/url]

Original 1.6 system/app FW 1.1.A.0.8:
[url]http://xdaforums.com/showthread.php?t=740338[/url]

Expose-app (post 114):
[url]http://xdaforums.com/showthread.php?t=740338&page=12[/url]

Keyboards:
X10 Mini: [url]http://xdaforums.com/showthread.php?t=794736[/url]
Wirless n on X10 Mini & Pro
[url]http://xdaforums.com/showthread.php?t=833930[/url]

JIT Overclock
[url]http://xdaforums.com/showthread.php?t=828929[/url]

CPU Scaling:
[url]http://xdaforums.com/showthread.php?t=791940[/url]
setcpu is free here for XDA members (thanks to coolbho3000): [url]http://xdaforums.com/showthread.php?

t=505419[/url]

Disable default Lock screen 2.1 & 1.6:
[url]http://xdaforums.com/showthread.php?t=842717[/url]

Java Box:
[url]http://xdaforums.com/showthread.php?t=845681[/url]

Replacing the stock calendar app with default android calendar (2.1 only?)
[url]http://xdaforums.com/showthread.php?t=850830[/url]

xRecovery:
[url]http://xdaforums.com/showthread.php?t=878427[/url]

script to install xrecovery, bootanimation, reboot on power menu and jit
[url]http://xdaforums.com/showthread.php?t=888250[/url]

[size=+2]Tools & Misc:[/size]

[TUT]Tutorial for making Custom Rom:
[url]http://xdaforums.com/showthread.php?t=888227[/url]

aZuZu X10 mini Small Kitchen:
[url]http://xdaforums.com/showthread.php?t=897662[/url]

aZuZu Small Tools 4 SE x10 series:
[url]http://xdaforums.com/showthread.php?t=830129[/url]

Working Kernel (2.1) Modules for Mini / MiniPro / X8:
[url]http://xdaforums.com/showthread.php?t=876663[/url]

X10 Mini Cleaner/One Click Framework Install:
[url]http://xdaforums.com/showthread.php?t=845130[/url]

Mapping a key to end call:
[url]http://xdaforums.com/showthread.php?t=911538[/url]

[size=+2]Themes:[/size]

[b]X10 Mini/Mini pro Theme Reference for Newbies:[/b]
You can see all themes in the 8 post
[url]http://xdaforums.com/showthread.php?t=849223[/url]

Show Off Your X10 Mini/Mini Pro Screenshots Here!
[url]http://xdaforums.com/showthread.php?t=819992[/url]

Black Theme 1.6 & 2.1 X10 Mini & Pro:
[url]http://xdaforums.com/showthread.php?t=821790[/url]

drago_ag's black htc: [url]http://xdaforums.com/showthread.php?t=821790[/url]

manny-'s xtreme: [url]http://xdaforums.com/showthread.php?t=896943[/url]

baunegaard's gingerbread: [url]http://xdaforums.com/showthread.php?t=906176[/url]

shivenjuneja's gingerbread: [url]http://xdaforums.com/showthread.php?t=883359[/url]

manny-'s xtreme + shivenjuneja's gingerbread: [url]http://xdaforums.com/showthread.php?t=872020[/url]

[size=+2]ROMS 2.2:[/size]

X10 Mini:
[url]http://xdaforums.com/showthread.php?t=961707[/url]
X10 Mini Pro:
[url]http://xdaforums.com/showthread.php?t=961783[/url]
2.1.1.Clean.0.0 for X10 Mini Pro
[url]http://xdaforums.com/show...php?p=16412835[/url]

[size=+2]ROMS 2.3:[/size]

X10 mini xCyanogenPro - Gigglebread - v3.0:
[url]http://xdaforums.com/showthread.php?t=977013[/url]

X10 mini pro xCyanogenPro - Gigglebread - v3.0:
[url]http://xdaforums.com/showthread.php?t=974392[/url]

Please, if you see any errors, tell me! My english is very bad...

Thank you!