Well, I've had the 20D for about three weeks now, and my opinion is.. too busy snapping photos to write about it! I absolutely love it!
My D60 was no slouch, and there was a huge step up in responsiveness and capabilities when I got the D60 to supplant my Nikon 990.
The difference with the 20D is every bit as big a leap in usability. That's my opinion in a nutshell. This camera never makes me wait for anything, even with a quite slow 1GB CF card for storage. It is fast, fast, fast, and that is far more important than I thought it would be before getting the 20D. Makes a massive difference for me.
More later.
Cheers