Nov 1st 2010 11:16PM Everyone will have to wait for midnight Pacific Standard Time. Confirmed by new blue post: http://blue.mmo-champion.com/t/27497533857/cataclysm-realm-launch-time-information/
Oct 29th 2010 3:04PM Actually it will be patch 4.0.3a, when the Deathwing actually breaks the world.
Oct 12th 2010 5:51PM I think Mumble is much better then vent. Go Mumble!
Nov 24th 2009 3:54PM There is no limit. The guild my main belongs to has ~5100 toons (~1600 unique members). It brings the armory page to its knees, lol. It is one of the largest in the world.
About the 500 number someone mentioned; the guild tab inside the game is broken. It will only display a maximum of 500 toons. If your guild is over 500 toons, the tab will create a list of 500 guild members randomly from all of the toons. Then it will highlight which of those members are online. It will not even show you all the currently online members.