Not to be out done by Mike's great shot, I pushed it as far as I dare.
I'll try to generate a GIF that should show the speed.. but MAN, I can still feel that compression wave! Scary as hell!
Oh, Mikes shot http://www.pbase.com/image/108155966 Canon EOS 1D Mark II N 1/2500s f/4.5 at 12.0mm iso500
full exif