From what I'm seeing in reviews in regards to video only, it's a bit hard to notice a big difference between the 550d, 7d, and 5dmkII. The reviews were made before the 60D was out, but I presume it would be similar.
The top Nikon camera beats Canon in extreme low-light (there was a test where they used a match as the single light source), but in regular conditions Canon cameras make better videos.
The big advantage the 60D brings is the tilty-swivelly screen, and the manual audio volume. The screen seems interesting. If you're serious about videos, you'll probably end up getting a better audio recorder, such as the Zoom H4N down the road anyways.
If you're looking at the photo side or the toughness side, though, then the 60D is faster and more solid than the T2i, and the 7d is even more solid than the 60D.
Finally, the T2i and 60D have SD/SDHX/SDXC cards, while the 7D has CF cards. I never owned a CF card-enabled camera, so can't comment on why there seems to be a consensus that CF is better.
Cameras: Canon EOS 6D, Canon EOS Rebel T3i, Canon EOS Rebel T2i, Canon S90
Lenses: Tamron: SP 24-70mm F/2.8 Di VC USD, SP 70-300mm F/4-5.6 Di VC USD, Rokinon: 8mm Fisheye cine, Canon: EF-S 18-55mm f/3.5-5.6 IS Lens, 75-300mm f/4.0-5.6 III, and EF 50mm f/1.8 II
Retired camera: Fujifilm Finepix s700