Thanks all---I have Steam, but am feeling that I've tapped out their Mac platformer options though.
OK, can you give me your top reasons why I should buy a PC? (I.e., awesome hardcore platformers I will be able to play.)
For reference, my top games right now would probably be Super Meat Boy and 1001 Spikes. These play on Mac and PC and are super fun. 1001 Spikes is unfair with traps a la IWBTG, but less grievously so.
The Jumper series by Matt Thorson is the first thing I'd be itching to play on PC. Any more like this I should know?