Is there such a thing as a 10GBase-T SFP+ transciever

I would like to know if anyone has seen one of these? If so where? Also if they don't exist why? It would seem to me that it would make it a lot easier to play mix and match with fiber in the DC if they did. Would be so hard to make the 1G SFPs faster (trying to be funny here not arrogant). -James