300 Days, 300 Game Mechanics

Squidi is trying to define one unique game mechanic a day for three hundred days (via TIGSource). Some mechanics build on each other and he provides illustrations and descriptions. He's into about day twenty now.

Update - in what I'm sure is just another coincidence *cough*, Kotaku posted about this shortly after. Now the site is down as an after-effect, presumably from the traffic. Yay. (Update 2 - and now it's back.)