Just finished rebuilding my Vista machine and needed to install Virtual PC and remembered Dougie mentioning Virtual PC 2007 (beta Release Candidate) is available.  A quick search turned up the

Virtual PC guys blog:

Virtual PC 2007 Release Candidate is available

Unfortunately the first couple attempts with the link he listed took me to the connection site but an error on the link and the connection site -didn't list Virtual PC 2007 as being available<sigh>.

After a couple of false starts i finally found the right  links: