There's always AOI, with CB's playing close to the LOS, they can put a confidence hit on the WR. Other ones I've seen are:
Wrap-up
Jack Hammer
Also depends on what type of CB you want to play, hard hitter - go with a monster hit, or something like that, blitzing CB - blitz or disguise blitz, Zone CB - zone specialist.
I've never seen people dump a lot of points into the extra ability, mainly because there are so many necessary ones like SV, SDC, SB and closing speed.