Steam for Mac and FREE Portal Download
I already have Portal on my PS3 (a system Valve should've supported first, before Macs, in my opinion), but who can argue with a free game? And a really good one at that. But, hey, maybe having Steam for Mac, and over 63 games available to play at launch, will finally lure Mac users to the gaming realm and legitimize Macs as a gaming platform. Probably not, but at least someone's trying.