Until now I have only worked with svn and git. So I am very curious about the Team Foundation Server and Team Explorer which all talk much about. The best thing is the integration with the issue tracking. I can see all work item, or just my work items. Another fine feature, at leat if you use codeplex, is the Team Explorer Everywhere.

The Team Explorer Everywhere client works on Windows, Linux, Mac, or Solaris. It provides a command line client and plug-in for Eclipse to access Team Foundation Server. For information on obtaining the client and connecting to the Team Foundation Server please read the Team Explorer Everywhere Client wiki page. You will need the information on the right to connect to the Team Foundation Server in Team Explorer Everywhere.