I don't know if I've posted these, but I'm gonna anyways...
Angry Birds - Wicked fun physics based game. Use a slingshot that chucks birds at objects to get to the pigs. The graphics, sound and gameplay is beyond reproach for a cartoon-y game. Love it.
Olive Tree NKJV Bible - They just added a bunch of features in the latest update that makes it very easy to search and a took tons of bugs out. It's very useful now.
MLB.com at Bat 2010 - Streaming ballgames. Have to have the mlb.tv subscription, but it's well worth the money if you love ball.
Speedtest - By speedtest.net. Good for checking jacked wifi to get a good connection speed.
5-0 Radio Pro - Scanner app with a zillion feeds. Good if you're hiding from the cops.
Sportacular - Quick scores and boxes. The best sports app I've found.
The Weather Channel - Nice, clean weather with radar.
DoodleJump - It's just fun. I've long since grown tired, but it was fun for waiting rooms.
VoicePlus - Voice changer. Fun for messing with the kids.
TFLN - Mindless drivel, lots of hilarity in there. It's Texts from Last Night. User submitted humorous texts. Very adult and very tacky.
UPS - Check your tracking numbers.
USA Today - Great news app. I have always loved USA Today, so it fits perfect. It's very well done, too.
Goby - The coolest "What's going on here where I'm stuck?" app I've seen yet. It pulls up tons of things to do in the area you're in. Even obscure stuff like live music at the winery. Kind of a "local entertainment" newspaper page for wherever you are. It's just plain cool.
MoonPhase - I always pay a lot of attention to the moon. It's a nice clean app for finding out everything I need or want to know.