The good news, however, is that Valve has separated out Windows and Mac stats in the hardware survey, so even though there are a few less percentage points of people to look at, we have a lot of interesting information about those Mac users. As you can see in the graphic above, the majority of them are actually playing on a MacBook Pro -- iMacs are the next biggest model on the list, but represent 25% of Mac users as opposed to the MBP's 49%.
Steam is also promising a list of most commonly installed Mac applications, but as of this writing, that information isn't posted quite yet. Unfortunately, while Steam is installed on a wide variety of Windows computers, I'll bet that it hasn't quite reached widespread adoption on the Mac side, so these stats will be specifically for Mac gamers rather than the Mac audience as a whole. But it's always interesting to see what stats come out of the Steam Hardware Survey, as a snapshot of just what our technology profile looks like.