Already picked it up. I haven't heard of any of these games before, but since Notch went and paid two grand for it, I felt it was OK to be a bit on the cheap side. At least I sent all of my money to charity, as little as it was.
I spent a little time with each game and I'd say Cogs is the best of the bunch. It's a sort of steampunkish puzzle game that incorporates some 3d elements to the standard slide puzzle.
And Yet It Moves is platformer/puzzle game where the trick is that you can rotate the game screen around your character at anytime. This let's you basically manipulate gravity. Moderatly amusing.
Crayon Physics deluxe is a version of the drawing objects to solve puzzle with physics type. A flash version was fairly popular in the Asylum a couple years ago.
VVVVVVV is a pretty lame platformer with retro graphics and sound.
Hammerfight is a mouse based fighting game with odd looking flying machines with maces attached to them. The controls are a bit wonky, and it's the only game that I couldn't find a full screen option for. I didn't play it for very long.
It's worth tossing few dollars at for Cogs and Crayon Physics Deluxe, the rest aren't that great, but it's for a good cause so you might as well break out your wallet.
Edited, Jul 26th 2011 7:58pm by Turin