I use Source Safe currently, but planning on adding either AccuRev or SubVersion. However, ultimately what I need is a capability to keep history of changes to servers (some of them remote) and to be able to see where servers are out of sync. Knowing the history of a server and keeping them in sync ultimately seem to be the end goal of a lot of the requests I've seen in the forums (in the VERY short time I've been here). You may be interested in partnering with a company to resell the tool that can show the changes, branches and merging of the various objects.
Boy now THAT would be the ultimate.
But to come back to earth, having Source Safe Integration would be very helpful.
I'm looking forward to this release.