I am glad that the 7D, like the 40D, offers the options of saving three user settings to C1, C2, and C3. The burst speed is amazing, too. And yes, the AF is a lot better than the one of the 40D. In reality it should not take very long to learn the buttons layout and functions of the 7D after the 40D. Yes, the AF choices are numerous, but the "Quick something button" (the one with the "Q" in the middle, whatever it's called), is quite useful. Like the 40D one can adjust most of the default settings. But a feature I haven't tried, one that's not available on the 40D, is the DOF adjustment. I will have to wait a little before I try that one, as well as lens micro-adjustment.
First I will try all the lenses and see how things look.