i cannot wait for steam and linux.
Didn't you ask about using Linux?
Again - Just because Steam is coming to Linux doesn't mean the games are compatible with it right out of the box. Go look at what you can buy for Mac, that's about as good as you'll get (if even that).
EDIT: I might be misleading. A good chunk of the library will run with WINE, but Valve has no control whether or not they can distribute games for Linux with WINE. Otherwise the Mac OS X library would be a lot larger (unless they include WINE anyway).