ArenaNet is showing some much needed love to all you Mac OS X gamers out there and has released a beta version of their Mac client for Guild Wars 2. You'll be able to jump right in and start playing (if you've purchased the game) and will be joining the PC gaming crowd on the same servers they are playing on. You'll find the download for the client on your account page.
The requirements to play Guild Wars 2 on a Mac are as follows:
Mac OS X 10.7.X or later
Intel Core i% or better
4GB Ram or better
Nvidia GeFore 320M, ATI Radeon HD 6630M, Intel HD 3000 or better
25 GB of available HDD space
Internet connection (of course)