Visual Studio 2008 and Visual SourceSafe
If you are using Visual Studio 2008 in combination with Visual SourceSafe (VSS) you might be experiencing some problems. These are because the updated VS2008 support for VSS didn't ship with VS2008 as it was supposed to. There is however a CTP with the VS2008/VSS integration you can download that should fix the problems for now.
More details and a link to the CTP download here: http://blogs.msdn.com/richardb/archive/2007/11/19/vs-2008-users-remember-to-download-the-sourcesafe-ctp.aspx