Just as a heads up. I have run across a bug in Team Explorer/TFS Beta 3 Refresh:
Team Explorer Beta 3 Refresh-
If trying to add a document to a project via Team Explorer and the document name contains certain characters a non descript error is displayed. The known characters are [ or ] . There are likely other characters. These characters are fine within Sharepoint Services and opening of the file via team explorer works fine but uploading such files causes the below error.
Error: The underlying Connection was Closed. The connection was closed unexpectedly.
This bug report is:
http://lab.msdn.microsoft.com/ProductFeedback/viewfeedback.aspx feedbackid=00813ea0-ef21-4269-8023-102d8b61b8cf
Please place a vote if you can duplicate or feel affected by this bug.

Team Explorer doesn't support filenames with characters [ or ].
Heidi