The game I always play is jubeat plus (jukebeat outside of Japan), it's a rhythm game. (music packs can get expensive though)
I also have Risk, Monopoly, Scribblenauts Remix. iSlash is also pretty good and fun in short stints.
My friend is always playing Kingdom Rush on his iPad.
I'm also thinking about picking up some of the Cave (bullet hell) shooters once I get my iPad on Friday. (I sold my iPad 1 last month as I planned on getting the new one.)
World of Goo sounds nice, although I already have the PC version.
Need to try out Back to the Future (adventure game) as well, the first episode is free I believe so you can try it out.
starcraft: "I and every PS3 fanboy alive are waiting for Versus more than FFXIII.
Me since the games were revealed, the fanboys since E3." 
Skeeuk: "playstation 3 is the ultimate in gaming acceleration"
