Doesn't get much easier than this...
down around the middle of the page is a file that you download and after you open it up and follow the directions you will be able to fine tune your lenses for optimal focus....

AF microadjustment for the 1Ds mark III, 1D Mk3, 5D Mk2, 7D (http://www.northlight-images.co.uk/article_pages/cameras/1ds3_af_micoadjustment.html#af_microadjustment)

thanks for the link... I will have to try this out when I get mine.