Same sensor, but the 7d has twice as many readout channels, I think? In theory that could mean less skew and/or other advantages, but in my experience video from the 7d and t2i/t3i (never used a 60d) is indistinguishable. If anything, I think I like the t2i's image more...probably because I own one. But I couldn't tell the difference double blind if they were set the same and had the same lenses. Video closely resembles the 5DII but in theory the smaller cameras have a little less resolution, a little more noise, and are inexplicably faster at a given ISO (not enough to cancel out noise)...plus obvious DOF differences.
The t2i and 60d will take cleaner stills since the fewer channels the less banding noise but the 7d is a killer still camera in terms of ergonomics and interface (minus the now sub par screen). Very nice camera.