Here's my top pick:
UCLA DT Kenny Clark shows intriguing potential in bowl loss - NFL.com
We have some potentially devastating losses on the defensive line if certain things happen/don't happen: Hatcher retires and Knighton isn't resigned. Baker is the one solid DT we have left. RJF was good in spot duty, but I think we'll sorely miss Hatcher's pressure (even if he didn't always get there). Clark would be an awesome, versatile piece to the middle of the defense.