According to CNET Microsoft is postponing the release of the Windows 7 Public Beta for an undetermined time. Apparently this is due to the servers being slammed and not being able to keep up.
"Due to very heavy traffic we’re seeing as a result of interest in the Windows 7 Beta, we are adding some additional infrastructure support to the Microsoft.com properties before we post the public beta," Microsoft said in a blog posting, which was itself hard to get to as of 1:20 p.m. PST. "We want to ensure customers have the best possible experience when downloading the beta, and I’ll be posting here again soon once the beta goes live. Stay tuned! We are excited that you are excited!"
Not that we want to see any other servers crash, but CNET links to a Neowin report that lists a direct link where folks can still get the code.