Few 70-300L test shots (60D)
Yeah, the 60D is pretty good with high ISO settings (alhough I would love to try the Nikon D7000 for this as well). In low light (such as the first two images), I find images to be useful up to 1250-1600. Then, it becomes too grainy (when magnified on a large computer screen). My most common ISO setting is 1000. I try not to go beyond it.
Nice high ISO performance!