Just a quick note: Microsoft has just released Beta 1 of the next Visual Studio code-named "Orcas" (Team System and Professional Edition and TFS) for
MSDN subscribers. A public download for everyone, however, are the
"Orcas" Express Editions. The website labels them as Community Technology Previews (CTP), but since their release coincidse with the "Orcas" beta for Visual Studio, they are most probably using the same codebase.
Update: Forgot to mention that there are also
VPC images available, time-limited though.