Lets start with the fantastic:

Thats Half Life 2 running on an Intel Core Duo powered Apple iMac, with a little help Boot Camp. This has already got folks from both the Windows and OSX sides of the aisle howling at the death of mac gaming. Why care if a game makes to the apple tree if you can run it just as well on windows on the same computer?
…But not so fast! Blizzard, makers of the most popular online game of the past few years, is championing continued support for native OSX.
In the end, more macs in the market mean more games for mac. Its simple math. Emulation, even sanctioned emulation, can’t take the place of the real deal. Apple has the gamer crowd’s attention now, with even those Penny Arcade guys playing on Macs. I just hope they use it and throw some weight behind game development because houses porting Sims expansions won’t cut it. If they did half of what Microsoft is doing for games, Apple might switch more than just music lovers.