Many amateurs imaged the asteroid flyby as well. I have a video at:
http://www.youtube.com/watch?v=LCN77UZ2RUo
The asteroid dips in brightness every 11.66 minutes -- you can see it regularly changing brightness in the video.

Its only ~10m in diameter. I keep picturing Bruce Willis strapped to the rock in a black space suit going round and round every 11.66 minutes....