I just got an HD200 and took it out on a 2 camera shoot with my old HD100. On the HD200, the 30P setting looks very 24Pish. I had to switch to 60P in order for it to match the HD100's 30P. When I do that though, they don't match on the timeline. I've gone through everything I can think of, and all other settings are the same on both cameras. Why does the 30P setting on these cameras look so different?

Sounds like the shutter speeds are mismatched.

It looks like it too! Both cameras are on Shutter Off (1/60).

Have you checked the shutter speed? It should be on and at 1/60th for both

Turn off Motion Smooth in HD100.
Should help.