Marque, dlfurman is correct, the beta was closed some time ago.  But apparently they will be opening it back up once the release candidate is put out there.  No idea if or when that will happen. 

Ok hborre, thanks for the info.  I haven't run into any problems either, just a few that were hard coded to Vista or XP (rather than allowing versions newer than a certain one).  I'm really happy with it so far.