Reports are that the Apple stores can't keep them in stock, same with the iPod Shuffle.
but GAMES still are tied heavily to the OS/Hardware.
There are a lot of top-title games available for the Mac, like C&C, DoomIII, Alien vs. Predator, Civilization, etc., although the one any specific buyer wants may not be available.
Most MAC games are DATED at best... the new release MAC games are often released long after their PC counterparts.
This might someday change if they get enough market share... but for the long history of the mac, it hasn't.