From bharry's blog: http://blogs.msdn.com/bharry/archive/2005/12/03/499788.aspx
"I'm pleased to announce that a pre-release version of a MSSCCI provider for Team Foundation Server will be available shortly. This provider will allow the version control functionality of TFS to be accessed from within VS6 (and many other IDEs). This provider is going to be an unsupported tool and won't be an official part of the TFS release. None-the-less we realize that it will be a valuable addition for many customers and will work hard to make sure it is good. At this time it does not support VS2002 or VS2003 however we are working on adding that support and expect to have it in a few months. I'm expecting the provider to be available for download sometime within the next week or so."