inFamous 1 and inFamous 2. And the standalone downloadable game inFamous: Festival of Blood.
Also, God Hand is on PSN. If you don't already have it on PS2.
The PS3 Ratchet games are alright but if you haven't played the PS2 ones you absolutely have to play those first because the PS3 ones are asssssssSSSSZZZZ compared to Going Commando, Up Your Arsenal, and Deadlocked.
El Shaddai is great but I'm pretty sure it's on 360 too so namedropping it in this topic is kind of silly.
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[NO BARKLEY NO PEACE]
im here to you dark soul with my LIGHT -ertyu