barcode scanner - scan qr codes and barcodes
google sky maps - uses gps to tell you star names and planets
my tracks - tracks your jogging/biking/whatever route. gives data on it. cool.
opera mini - my preferred browser
pdanet - connect phone to computer to internet. awesome when not around wifi
shazam - tells you what song is on
tunein radio - one of the best radio apps ive found
y! Music - nother music app i like (uses less batt than pandora)
wordfeud - scrabble against friends. fun.