[HTC Aria Themes and Apps] CallMeAria:
Here's my current list of must haves for me:

Dialer:

Dialer One

free: youlu used to be nice but is too bloated now.

SMS:

Handcent.

free: (honestly there is no longer any difference between this and GOsms anymore. I was using Go for about a month and I came back to Handcent for one reason...I prefer the Handcent popup over Go's popup).

Explorer:

Root Explorer

PAID: sure its a paid app but its worth it. Astro is probably the best free one Ive used (but I noticed Astro leaves a service running after you use it)

Browser:

xScope

free: Ive literally tried em all and xScope is just brilliant. Its not clutted like some of the others and is BY FAR the fastest browser out there.

Music:

Poweramp

PAID: I havent tried winamp, but Poweramp blows everything Ive tried out of the water. Its intuitive and the equalizer is amazing.

Keyboard:

Smartkeyboard

PAID: Its scary good at predicting. I believe once Swype gets all its predictive issues ironed out it will be the best. But in the meantime Im sticking with this.

Launcher:

LauncherPro Plus/ADW EX

PAID: Ive been switching back and forth between LPP and ADW EX. Right now Im using ADW EX simply because it allows me to completely hide the dock which works with the look im going for. Both are pretty much equal on a performance level. LPP still feels a little smoother though.

Weather:

GoWeather

free: If you havent tried this one, try it. Its nice.

Misc:

Tasker

PAID: It does everything. If you want something automated, this will do it (except for background data, for whatever reason it cant control background data :( sure wish I could set it to turn background data on/off with the market.

BTmono:

free/PAID:I'm able to listen to Navigation through my Bluetooth headset with this. I use the paid version for the widget but the free version works just as well. It also plays music through the BT.

Desktop Visualizer:

free: Probably one of the most useful apps when it comes to customizing your phone. Especially if you use large screen grids like I do which make icons impossibly small (10x10)

Colorize Widgets:

free I love the Contacts widget and the Agenda widget. Amazing free app.

Calendar Pad.

free: I prefer the month view in my calendar and this app is more informative in that view than the stock calendar app.

Quickpic:

free: Super fast gallery replacement.

gMote:

free: I have my computer linked to my TV for movies, but its out of range for a remote/keyboard/mouse. So this allows me to control the computer from anywhere. And this is the only remote app I found that doesnt require your computer to be connected to a wireless network, it can just use your computers IP address.

S2E.

free: Sure its CM7 only, but if you're on cm7 its time to get rid of DT or the built in a2sd and just use this app. Its in the market and its so easy a caveman could do it...

Titanium Backup Pro

PAID: This is simply the best. It does everything you could want a backup program to do, and then some. Ive never had a single issue backup/restoring using Titanium. The free version is still probably second best :cool: , the only thing its lacking is a one click restore feature