I guess I'm wrong.
Check this out.
http://www.sportsnet.ca/football/nfl/players/Mike_Goff/
Pros:Tough, powerful run blocker. Can drive his man off the ball. Seems to get better every year. Has the experience to play center.
Cons: Not a natural athlete. Can get out-quicked by speed rushers.
(This was probably written a few years back. He's not a great Run Blocker anymore)