[XPERIA X10 Themes and Apps] exekias:
This list has been compiled from own experience and from this thread here, Some apk's might be a lil incorrect as... well they aint on my phone no more duh so i dont know what their called.

http://xdaforums.com/showthread.php?t=825814

Apps Remove

*[moxiermail.apk] MOXIER An App for syncing Email,Contacts,Calendar and Exhcnage, Not Needed

*[Danish_keyboard.apk] Danish Keyboard are you danish? no? remove this.

*[JapaneseIME.apk] Japan Keyboard are you from tokyo? do you like hello kitty? no? remove this.

*[SEMCTouchPalKoreanQWERTY.apk] Korean Keyboard Do you like Kim Jun Il? no? remove this

*[chinesetextinput.apk] Chinese Keyboard Chinese? Communist? no? remove

*[quadrapop.apk] Quadrapop a really crap game, remove.

*[Email.apk] Email Stock email app, this is not the Gmail one.

*[EManual.apk] & [usersupport.apk] & [uuserguide.apk] The Help Files Its the User Guide for those users not from Generation Y

*[wisepilot.apk] Wisepilot Some Gps app, remove it you have GMaps

*[SEMCSetupWizard.apk] & [SEMCsetupguide.apk] Setup Wizard That program that set up your phone when you first turned it on.

*[playnowback.apk] & [playnowclient.apk] & [playnowappinstaller.apk] Playnow - this is an internet music service integrated into Mediascape & the SE app store

*[officesuite.apk] Office Suite A bare bones app for viewing doc, pdf,xml etc files on you phone, ooooooooooooooooo google docs any1?

*[Telenor_Wrapper.apk] Telenorwrapper (idk wat it is)

*Supernytt This can be removed via the normal Applications

*[creatouch.apk] Creatouch Some random SE paint program, Piece of SH!t

*[backupandrestore.apk] Backup&Restore (lame app)

*[SemcHomeL.apk] HOMELauncher (get a alternative, best backup or freeze)

*[PcCompanion.apk] PC Companion the installer that will install the software on your PC upon USB connection, i suggest remove

*[Browser 2.1-update1] Browser (suggest you backup, dont forget to install your own browser i suggest

opera

)

*

Timescape

It has been confirmed by myself and others that you do not need this friggin app, remove the following files. i have Back'd them up just in case.

[Timescape Provider 1.0.0]

[Timescape 1.0.0]

[Timescape Plug-in Manager 1.0]

[Timescape Theme Blue 1.0]

[Timescape Theme Green 1.0]

[Timescape Theme Indigo 1.0]

[Timescape Theme Orange 1.0]

[Timescape Theme Sakura 1.0] (sakura = purple lol wtf?)

*

Mediascape

<<i suggest you leave mediascape, timescape can die in hell but you really do need mediascape as its intergrated into too many things wallpapers, camera, browser, etc>>

Without this i suggest you take the galley apk from here

http://xdaforums.com/showthread.php?t=826311

If you remove mediascape, the default browser will not save most images, so if you remove mediascape get an alternate browser

[Mediascape 1.0]

[Mediascape Plug-in Manager 1.0]

___---WIDGETS---___

*[DigitalClock.apk] Digital Clock

*[StatusSwitch.apk] Status Switch widget

*[RecentCalls.apk] Recent Calls Widget

*[Search Widget] Googel Search Widget (i do not recomend, un tested)

___---Apps i suggest you don't remove---___

*Anything Google

*Phonebook (can be removed, just gets messy and you HAVE to have an alt) [Phonebook.apk]

*dialler

*Msging

*places / latitude (its built into maps, u need maps)

*sim toolkit (this can be removed BUT i do not recomend it as some service providers have other apps on the sim card you may need, SO UNLESS YOU KNOW for sure you have never used the sim-toolkit, i recomend leaving it there. [SIM ToolKit 2.1update1]

___---Lost?---___

First you need to root so go here

http://xdaforums.com/showthread.php?t=824788

Then install Titanium Backup (i suggest you use this method over root explorer)

http://www.appbrain.com/app/titanium-backup-%E2%98%85-root/com.keramidas.TitaniumBackup

Or root explorer

http://www.appbrain.com/app/root-explorer-(file-manager)/com.speedsoftware.rootexplorer

Titanium Backup will allow you to Backup/Uninstall and Re-install all of these files, If you have the donate version you can "freeze" an App to see if it breaks the system, and so if you encounter any issues you unfreeze,

OR in root explorer travel to System/app

and make sure you click [Mount RW]

cool anything else dont be afraid to ask, but remember search first!