well i am in the position to buy a new camera. If i go with the 40D im not upgrading sensor size at all from what I have. However in talking to a few canon pros/endorsed photogs I know that bought 50D as their backup rig they are all selling them and buying 40D bodies again due to noise issues. The 5D would be the logical step but the price and slow burst rate/slowish auto focus are kind of a turnoff.........im shooting mainly slower speed sports like climbing and kayaking and also doing a lot of flash work so the auto focus wouldnt be too much of an issue i dont think. Also does anyone know if my current lenses would work on the 5D? i am shooting the 10.1 megapixel version of the rebel right now and have some decent glass for it and wont be able to afford new glass for a while if I buy the 5D. hmmm.....decisions.....