I shoot HDR with a Canon 40D. I often use more than 3 RAW exposures, which is a hassle on the 40D since the auto bracketing only supports 3 exposures.
I'm aware of the CHDK project, but it doesn't support the 40D (yet), and I'm also aware of the Magic Lantern project, but it also doesn't support the 40D. The Promote Control will do it, but at over $300 is a bit out of my range now.
So this is a bit of a stretch, so, aside from going into manual mode and spinning the top dial between shots, is there a way to get more than 3 bracketed shot with a Canon 40D?