In case you haven't stumbled across this feature yet, a pdf available from this pagehttp://www.usa.canon.com/dlc/controller?ac...&articleID=1186
has quite a bit of good info in how to use all the custom features of the cameras, especially for auto focus settings in different situations.
What intrigued me is the end user can now make corrections themselves to calibrate the camera or different lenses to correct front or back focusing. I know some have resorted to sending bodies/lens into Canon service to accomplish this before ... this sounds very helpful. Not sure how well it works but will be testing it out.