I've been keeping up with this as I also have been in the beta program, there are currently 12 vista releases (that I'm aware of), some of which do include the server utilities as mentioned bofore (IIS7), I have yet to get a good feel from vista, and will probably (like most) wait until more development is done for it before using it on a required system.
Currently the only thing I can say about it is from my home release version, and that is, it doesn't support my graphics card (nativly) and when I use the XP Driver (which works) it blue screens every so often... That and it isn't compatable with my video games ^^
Anyway, here is a microsoft article that was released covering some of the different releases:
http://www.microsoft.com/presspass/press/2...ProductsPR.mspx
Edit: Mis-type there are 12 releases, 6 versions (32 and 64bit for each). Please keep in mind this product is still beta, and my XP Beta had the same issue until the official launch, which seemed to fix the issue....