Fate v2.0 - Just straight awesomeness in game form!
The Window - difficult to read on the web and somewhat verbose, but at the core it has a nice fluid gaming system.
Nicotine Girls - Strange one, but the idea of motivations and methods struck me as cool.
Dice Chucker v3.0 - Similar to Risus with some interesting dice mechanics toward the end.
PbP Gaming - My take on doing something different for PbP, PbW, PbEM gaming. More of a GM-Lite combined story telling system. <Under Construction>