I recommend (free stuff)
PandoraBox (tracks new releases and price drops (classifies them as free or paid and you can save favorites to check them easely)
APOD (astronomic picture of the day)
planets (basic star map that shows constelations in real time... limited details though, but free)
Kanondrum (a drumset :p)
Shazam
Stanza
Games that are free:
Eliminate pro (online FPS)
PewPew (geometry wars type game)
Tapdefence (rather complete defence game)
collider
badaboo (fun 30 sec game)
topple (tetris with gravity) (& 2)
tapquest (maybe a bit too basic)
wordfu (haven't tried it though :p)
that should be enough for a little bit... use pandora to track free games (cheap games that go free as a promotion), and you might want to add a sudoku game in there :p
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