We've already listed a number of MMOs that will be features at the sold out Penny Arcade Expo this weekend, but now you can add Blizzard's set of games to the mix. Gamers who attend PAX this year will get to try out demos of Cataclysm, the upcoming World of Warcraft expansion, and the recently announced monk class in Diablo III. A StarCraft II demo will be available as well.

All of these playable demos were available at BlizzCon, but now PAX attendees will also be able to get a first-hand glimpse of the future of the Blizzard franchises. In addition, community managers will be at the convention to discuss the games with fans.