A patch has been released for those who are using Visual Studio 2008 (Orcas) Beta 2, WPF project types and using Team Explorer as the selected source control plugin. The issue manifested itself as a message prompting you to save when you build a WPF project (even if you had just done a save all).
Get the patch here: http://www.microsoft.com/downloads/details.aspx?familyid=f5bec6c2-4ef5-44f4-b149-3792acefed94&displaylang=en&tm
[Updated 10th September 2007] - There are more patches available. From Brian Harry's blog:
TFS Server
- KB941952 - Visual Studio 2008 Team Foundation Server Beta 2 - Version Control Branch/Merge operations have unexpected behavior
- KB942080 - Visual Studio 2008 Team Foundation Server Beta 2 - Deleting and re-adding Team Foundation Server global groups with the same name without closing the global groups dialog does not actually delete the original group
Team Explorer Client
- KB942039 - FIX: Visual Studio 2008 Team Explorer Beta 2 - Incorrect folder handling for Web Projects
- KB942072 - Visual Studio 2008 Team Explorer Beta 2 - Incorrect prompt to save during WPF builds
- KB942048 - Visual Studio 2008 Team Explorer Beta 2 - Web Projects no longer appear in Version Control and Annotating a file under source control hangs Visual Studio
Team Build Server
- KB942082 - Visual Studio 2008 Team Build Beta 2 - Builds fail after renaming the build definition