I would like to say that I have been a PC user for years, and my gaming has been and always will be a pc, but I have been using mac laptops because of their build quality since 2006. That being said however, I will be trading in my MacBook for an Alienware M11x here very soon, because I am tired of paying $1400 for a laptop that isn't as capable. I like small, portable, and light for a laptop, I think anything over 15.6" is utterly stupid and is no longer a laptop. The Mac laptops are great processor wise, but they are always lagging behind visually.
Now, on the Youtube video posted earlier about the guy "reviewing" Steam for Mac, he's obviously not a power user, he is a straight Mac user for starters, and apparently he doesn't understand the concept of beta software. Oh no, it crashed your computer. Oh no, your video card isn't supported, not my problem you bought an iMac with an IGP. Sounds like a personal problem but don't blame steam. Steam is fantastic for so many reasons. Mainly for me it is Steam Cloud. I format and reinstall Windows quite frequently, and not having to worry about backing up most of my save game files is very convenient. That guy was a moron.
Bottom line is, who cares what people spend their money on? Granted, at this point with the release of Windows 7 I can't recommend a mac to people like I used to, hell even Apple has stopped their trash talking campaign, but Macs are capable of everything a pc is. Mac OS X is in my opinion one of the best OS' ever made on a usability standpoint. I love the gestures it has, that netbooks don't, like the 4 finger swipe down to activate expose, it's window management is still far superior to Windows, multiple desktops, yes, linux has had it for years, but this is Mac versus Windows. At this point MS should have it built in. It's really ridiculous that they don't. But the king of PC games is still Windows. DX is still far superior to OpenGL, and while I used to love OpenGL, they just haven't updated it like they should have over the years. So to all the Mac users out there, welcome to the Steam party, but sucks that you have to suffer with lousy framerates. To all the elitist PC users out there, you sound like the mac users do.
Glide gaming FTW though. God I miss 3dfx.