You can run Age of Conan on a Mac Pro (and possibly some iMacs and MacBook Pros, if you can upgrade them enough), but it takes some tampering since the game isn’t available for Mac OS X.
So what do you do if you’re sitting on a Mac Pro powerhouse, like I am, with multiple processors and a wicked bunch of RAM? The solution is called Boot Camp, which is Apple’s dual-boot solution which will let you pick between OS X and Windows at startup. You need a copy of Windows of course, I’ve got Vista 32-bit running smoothly using Boot Camp, and will get my 64-bit version in there soon enough.
However, make sure you’ve got a decent graphics card. More or less the only Apple approved card that works, available today, is the GeForce 8800GT for Mac Pro. As I said, there might be options for iMac and MacBook Pro as well, both being rumored to be upgraded soon.
If you’re a Mac user eying Age of Conan, hoping it’ll arrive in Mac version soon (it won’t, probably not ever since it’s a Games for Windows key title), and starting up World of Warcraft with a sigh, then get Boot Camp with Windows and give it a go. Works like a charm.