Very nice photos! I always like to look at the metadata on photos and I see you've gone through quite an evolution with your Canon cameras, from Rebel to 20D to 50D. There was even something identified as "fujifilm".
I had a similar route, except I went from the Rebel to the 40D, and now the 50D. I love the new processor in the 50D. I do a lot of night football games and the ISO magic of Canon is quite evident there. I can shoot wide open on my 2.8, 70 - 200 mm lens, but usually don't have to shoot slower than 1/500th of a second, which can really stop the action in the shot - no blurriness at all.
On my list of next projects is to get some great bird shots. You've got some really nice ones. It looked like you used a 300mm lens for some of them. Which particular lens did you use, if you don't mind my asking, and how do you like it for overall shooting?
Camera profile: Canon 1D Mark IV, Canon 7D, 17-40mm L, 24-70mm L, 70-200mm f/2.8 L IS I, 70-200mm f/2.8 L IS II, 100-400mm L IS, 100mm f/2.8 L macro, 50mm, Speedlite 580EXII, Speedlite 430EX, Macro Twin Lite MT-24EX