James,
I agree. We're working on a website for our Standard Poodle client and she wants video of her dog moving -- she moves quite well, thank you -- so I'm thinking of giving the HD of the 5D MkII a try. It's been a while, but I used to handle some of those big studio cameras in a TV studio so I just might be able to figure out how to capture some decent video.

I also had a wedding client today ask if we could shoot some video along with the stills and that really got me thinking. The problem for me is moving intellectually between stills and video. I guess it's similar to when I shoot my moving shots in the ring. Time that first move and then press the shutter and pan like hell!!! But, at a wedding, you'd have to figure which segments you wanted to film vs photograph and that really requires two people shooting for different effects.

Anyway, I still believe the best application of that video function might be weddings. I just need to figure out how exactly to do it and still get the stills.

Jim