Quicker AF point selection

Most recent EOS digital cameras feature a multi-controller (a sort of small joystick) that's situated on the back of the camera above the quick command dial. This multi-controller has a number of functions, from navigating through menus to moving around an image in review mode, but it can also be programmed for use when shooting. On the EOS-1D Mark III, EOS-1Ds Mark III, EOS 5D Mark II and EOS 50D it can be used to select a focusing point without first having to press the AF point selection button. C.Fn III-3 on the EOS 5D Mark II and EOS 50D, or C.Fn III-9-3/4 or 5 on the EOS-1D Mark III and 1Ds Mark III will allow multi-controller direct access to the AF points.
Custom functions
EOS-1Ds Mark III
EOS 5D Mark II