I am digging around today looking for some TFS info, and found these reg hacks, which would have helped a ton when working for our last client. I wouldn't always be connected through their VPN, so when firing up VS2005 it would take a long time to timeout on the TFS server connection.

Rants of a Hippie Coder : A couple helpful Team Foundation registry settings

perma-info:

HKEY_CURRENT_USER\Software\Microsoft\VisualStudio\8.0\TeamFoundation
DWORD "AutoLoadServer" (Zero means do not reconnect automatically. )