If you are experimenting with converting from VSS or CQ to TFS I got mail from a contact on the converter team who is interested in contacting you and making sure the toolset meets your needs. Let me know and I can introduce you.
Here is some documentation on these converter tools:
VSSConverter - http://msdn2.microsoft.com/en-us/library/ms181246(en-us,vs.80).aspx
CQConverter - http://msdn2.microsoft.com/library/ms181248(en-us,vs.80).aspx