I've had an issue on two computers (my primary development machine and a virtual pc dev box) which I was finally able to solve today after many hours of frustrated searching and experimenting. Interestingly, this issue only affected my two machines
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Read the complete post at http://blog.devstone.com/aaron/2008/08/18/RepairingTFSsTeamExplorerBuildNodeInVisualStudio2008.aspx