Here's the general idea...  Watch one of the 50 or so webcasts that Microsoft has prepared as preparatory material for Tech-Ed, submit an evaluation, and earn an entry into a sweepstakes for Tech-Ed Conference Passes.

Complete List of Webcasts

Tech-Ed 2004 Home Page

BizTalk-Related Webcasts:

Check out the Architecture-related and other Developer-focused webcasts, as well...