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Northlight Images has a great article on how to use your LCD screen to check and fine tune your auto focus on your camera.  Canon’s two most recent pro-level cameras the 1D and 1Ds Mark III cameras feature a AF microadjustment setting.  You can use this microadjustment to fine tune exactly where your camera focuses the lenses to during auto focus.  This has been a often talked about problem with the occasional gross offender being written about extensively along with samples to backup the claims.  Previously the cameras and lenses had to be sent to the manufacturer for service to have the two adjusted.  The ability to set this in camera alleviates the need to do this.  Even if you don’t have the ability to make these adjustments you can test your camera and get an idea of if it is front or back focusing and approximate by how much.  Armed with this you can decide if the problem is extreme enough to warrant a trip to the repair shop.