At long last, we have a place for you all to find out about beta exams when they are open to the public, without having to read 70 different forums or blogs. Subscribe to this blog (for developer and IT pro exams, both) and you'll get a notice when one of the planners (Jim, Gerry, or J--cute, right?) has an opportunity for you to participate.
The best part is that you'll have a single place to go to find beta-related news of extensions, updates, delays, or issues* instead of trying to get info in bits and pieces from the helpdesk, from Gerry's blog, and from the semi-reliable blog of a short-tempered, second-hand source who will remain unnamed.
* I don't know what you're talking about.