Blizzard announced today that the multiplayer beta test for StarCraft II: Wings of Liberty is now underway. The client downloader is available through Battle.net for people who have received invites, and the system requirements have been posted as well. A list of known issues is up on the official forums.
Lots of questions about the Beta have been answered by Blizzard on a German website instarcraft.de. You can access the translated FAQ here.
In addition there have been a few live streams popping up for those of you want to get an early look at the game. Several of them are getting thousands of active viewers only a couple hours after the beta has launched. The masses are certainly writhing in anticipation for their opportunity to either get in on the Beta, or to pick up a copy of the game when it is released later this year. Here are the streams:
Several streams from Starcraftmethod.com
Wr3k's SC2 stream