Birds... Fast Birds... Focus Help Needed w/7D 70-200 f2.8 USM IS II

So far I'm impressed with my 7D and I think it's tack sharp. The images that turn out badly are like this one, where the subject is flapping around like crazy while I'm trying to get the shot. This picture was taken with crap light and me basically raising the camera quickly and trowing my faith upon the electronics. In this case, the bird was moving in three dimensions, including deceleration, while I was tracking, so it was a difficult shot.