N.O.V.A.!!!!!!!!!!!!!! COD zombies 1 and 2, Rolando, doodle jump, pocket god, nfs shift, spore creatures, prince of persia warrior within, angry birds and ROCK BAND!
Those are all my favourites, i do a LOT of gaming on my ipod touch and have a folder just for these games here....ive started playing assassins creed and its also reallly good!
Hope this helps!