North American subscribers to Battle.net, check your inboxes—and your spam box, in case its settings are too strict. Blizzard sent out another 100,000 invitations to the Diablo III beta overnight.
This message comes with a cautionary warning: phishers try to take advantage of this crap all the time, so be sure that anything you click is indeed from Blizzard or links to a legitimate Blizzard domain before you provide your login information. This is especially true if your Battle.net password is the same as any other you use elsewhere.
If you didn't get a beta key, don't worry, there will be another round of invitations in the future.