The January 2011 Refresh of the MSDN Library site has gone live. One of the new articles is a pretty thorough run down of the compatibility between different Team Foundation Clients (i.e. Team Explorer 2005, Excel 2007, Eclipse, Visual C++ 6 SP6, etc) and TFS 2010.
It even goes so far as to show the MSSCCI Provider Power Tool support.
This is probably one of those topics that I’ll pin to my favorites list in IE.
MSDN -Compatibility between Team Foundation Clients and Team Foundation Server: http://msdn.microsoft.com/en-us/library/dd997788.aspx