My faves/must haves:
Bank of America
Bible (from Youversion - one of the best out there)
ColorNote (for creating to-do/ grocery lists)
Cut the Rope (game)
Dolphin Browser HD (best browser out there IMO)
Equalizer (I have the custom set to loud cause otherwise the E3D volume is just too low)
ES File Explorer (for looking around on my sd card)
Evernote (for all my notes I want to keep in the cloud)
Flikie (for the coolest HD wallpapers)
Handcent SMS
IMDb (for movie showtimes AND for all those times I need to know "What else did he/she play in??" when I see someone on TV or in a movie)
iRunner (game)
iSyncr & iSyncr Wifi for getting music from my Mac to my phones
Lookout (Antivirus software)
PowerAmp - the best music app out there IMO
Shaky Tower (game)
ShopSavvy (barcode scanner & reports lowest price locally and on the internet for things)
Slice-It (game)
Tweetcaster (My fave twitter app)
WeatherBug Elite (love the weather radar)
Hope that helps and welcome to the fam
