Matt Bowen breaks down the game clinching INT by Green Bay Packers CB Tramon Williams in their Wild Card victory over the Eagles. He goes through the play in four steps, and says during one of them that this is "a teaching tape." No one could have played that INT any better. Follow the link to watch a video of the play.
It doesn't surprise me that Williams played with great technique. If he had great speed and size, then he wouldn't have been left undrafted. One of the side benefits to having a player like CB Charles Woodson on the team is that he's been a great mentor to the younger cornerbacks. Williams's success is a testament to his hard work, and the player that he's become.