I just got my 40D and I must say it is so much different from my XTi. First thing that I had to get used to was not relying on the LCD to give me all my settings. When I first turned it on, I just stared at the screen for 10 seconds waiting for the screen to display. The button layout is something that I'll have to get use to also.
Now I have to figure out how to set the drive modes and get the AE focus on the * set up.
I'm sure you will figure out how to get set up just the way you want it 

