Summary: Trent Williams is a very solid left tackle prospect, but he has lots of room to improve in the running game and I don't think he will ever be considered an elite pass protector in the NFL. Williams is making the move from right to left tackle in 2009, and NFL scouts will be monitoring his progress closely. The official Oklahoma Web site claims he runs the 40-yard dash in 4.82 seconds... we'll see about that at the Combine.
Player Comparison: Donald Penn. Penn is an athletic pass protector, but lacks a nasty demeanor against the run.