I think the general answer I read for similar questions is that fat loss in general is what's needed, and not necessarily specific exercises, BUT, I wanted to share an exercise that really seems to give me a "good" sore in that area, it is from the new KCM split sessions dvds and she calls them "good mornings", they seem really easy when I am doing them, but I always get the doms from that particular exercise.
You hold one dumbbell around 10-15 pounds up by your collar bone she does it by crossing her arms to hold the dumbbell, then just bow forward to table top and back up again, it's about a 2 count down and 2 count up.