Ilike to attend outdoor soccer game and follow the ball with the 40d at 300mm f5.6 or so, under the bright sun it give very clever pictures. I also take pictures of my friends playing hockey on indoor ice arena. It's indeed very dark in there.
I just bought a 580ex2 flash but I wonder how will players react at having someone to blind them at some place in the arena.
So, I would be very interested into seeing some of your pictures of "indoor public sport event with a flash" pictures. Of course any comment and exif is more than welcome.
To start the topic I will try to upload a picture of the kind of area I'm talking about.