Pong might drag you down a bit, try flash games for now
Nah, Depends on what kind of games you like. Here's a few of the games that I have on my taskbar at the moment (I put DX11 next to the appropriate ones since you got a DX11 card:
Dragon Age: Origins
Batman: Arkham Asylum
Modern Warfare 2
Team Fortress 2
Dirt 2 (DX11)
Left For Dead 2
Battlefield: Bad Company 2 beta (releases in March. DX11)