You guys are making me envious! I have been reading about the 40D and it appears to have significantly improved the three features I found wanting on my 20D: Difficulty of achieving focus in low light; sensor dust sensitivity requires frequent sensor cleaning; sensor noise above EI 400.
Photo.net has a good review to add to the data posted so far:
http://photo.net/equipment/canon/40D/
Now to start figuring out how to spend $1200 without the wife getting too peaved about it!
- Kit