Get these games N.O.V.A., Rock Band, Osu! (on cydia), Rythm Tap, Earth Worm Jim, Voltron, Alive4ever, Song Summoner, Innotia.
Incase of apps, I don't usually install some unwanted nicknacks just the bare essentials like twitter, facebook, YM, fring, Photoshop mobile (it's not as powerful as the...