These are the apps I use every day:
SpringFlash + Activator
SB Settings
Music Controls
SMS GV Extensions
BiteSMS
Seeing a pattern here? :P
I don't use ANY App Store apps regularly, though I used to use Pandora Radio a lot and started using it again a few days ago.
I do regularly use the native Notes, Calendar, Email, Camera, Alarm, and Safari apps, but they are built-in to iOS.