Canon has released several updates: new firmware for the Canon EOS 7D, version 1.2.2 (download it from here), and new firmware for the Canon EOS 1D Mark IV., version 1.0.8 (download it from here).
I recommend that when able, you do these updates. Full battery, newly formatted-in-camera memory card, no lens or a good Canon lens on the camera, and then do the update. Features and fixes could be useful, and there may be undocumented fixes also, I suspect.