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I've owned a 10-22 for about 6 months now. I love what I can do with it on my 30D. Especially good for high school sports where I'm on the floor 5 or 10 feet from the action.
Just read your review of the 10-22. The brick wall pic was amazingly square. When I get people near the edge of the frame at 10mm they look very "stretched out." Is there a problem with my lens that I should send it in for service?
No. Your lens is perfectly fine. What you are seeing is simply the consequence of a very wideangle rectilinear lens.
Rectilinear lenses keep straight lines straight, but the wider they are the more "stretched" subjects at the edges of the frame become. It's a consequence of the optical "mapping" of the lens, i.e. the way it translates what is in front of it onto a small piece of film or a small optical sensor.
If you use a fisheye lens, you don't get the stretching at the edges of the frame, but straight lines become curved, so you get a different type of "distortion".
The EF-S 10-22/3.5-4.5 USM is a remarkably good lens, and as you've found has very low geometric distortion for such a wideangle lens. However at 10mm you probably don't want to have people near the edges of the frame because of the way all such lenses stretch the image there.
