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I've had that happen to my videos too, I think it was with my Canon 60D, but could have been with my 7D. Usually happens when I'm zooming with my 10-22mm lens and usually indoors. It's like the aperture jumps open then back again in my case but looks the same as yours with a blip of over exposure. I figured it was the aperture trying to find it's setting, since it's a variable aperture lens, or perhaps some kind of electrical interference.

Having the 40D record video would be excellent. The resolution of 1024 x 680 is plenty for web video.

People do have to realize that the 40D was never intended to shoot video so it doesn't have a microphone or audio circuitry built into it. You will have to capture audio separately or lay down a background track of something like music.

But having the other ML still image features would greatly increase the use of the 40D for things like time-lapse photography and other applications.

I bought a Marshall Mini ballhead http://www.amazon.com/gp/product/B000CNPK3M/ref=oh_details_o05_s00_i01 so I could mount my iPhone onto my hotshoe of my Canon 60D/7D so I can do live video via Ustream while shooting video with the HDSLR. The problem with the set-up is that the phone weighs quite a bit and you really have to tighten down the tiny ballhead control to prevent any unwanted movement. Granted I was moving around and not shooting on a tripod so things tended to go with gravity.

My set-up was:

• Canon 60D
• hotshoe extension to allow more than 1 coldshoe device
• Left: Marshall mini ballhead with iPhone mount & iPhone 4 Right: Rode VideoMic on right.

This was a lot of top-heavy weight. If I was shooting on a tripod without quick movement it would probably be okay but with 4 swivel points (extension-hotshoe foot, bottom of mini-ballhead, ballhead itself, iPhone mount to ballhead) it's easy to get wonky. The iPhone mount to ballhead shouldn't be a swivel point but gets to be that way unless you really tighten things down.

I may do another shoot this week with the set-up on a tripod.

How about 720p in Crop Movie Mode? 60fps or 30fps.

Actually having variable magnification Crop Movie Mode for either 720p or 480p would be nice as the current crop mode on my 60D is pretty high magnification but I can understand that anything other than 1:1 pixel size in crop would require some interpolation for each frame.