Just picked up a new Canon 40D today, amazing camera.
I still have my 10D but this 40 is a huge upgrade.
startup time is almost instantaneous.
the lcd is huge
viewfinder is significantly brighter and bigger
the body is partially weather sealed
onboard flash is higher on the body so wide angle and telephoto lenses don't get in the way and vignette anymore
autofocus is much faster and there are more af points
ai servo works much better
and the picture quality is just tremendous. One of my main gripes about the 10D was that even if I cranked up the in camera settings, i still had to photoshop every picture, and when you're taking 300-400 pictures at a time sometimes, the photoshopping effort took all the fun out of the pictures. With the 40D you can leave every neutral and photoshop yourself, or you can use the in-camera settings now and no photoshopping required...
if you're looking for a new DSLR, i give the 40D a big
i know, this thread is worthless without pics but i just got it tonight so i'll post some over the weekend...