So, as I had mentioned there were some other things I wanted to get into when I was thinking about upgrading to the 40D. The big one I want to work on is infrared photography.
I have been looking at Life Pixel to do a camera conversion for me. I had thought about getting an old Rebel, or even a 2nd Rebel XT until I saw the 40D. I decided I wanted that for my normal use, so I can now save to convert my Rebel XT.
Some good samples here.