Earlier in the year I listed biographies and memoirs from best books lists for 2008. I just found that Neil Hollands did something similar at Book Group Buzz, except that he did it for more categories and used more lists. I looked at seven lists. He looked at 80. We had the same two books come to the top of the biography list - The Hemingses of Monticello: An American Family by Annette Gordon-Read and The Bin Ladens: An Arabian Family in an American Century by Steve Coll - both family biographies.
Neil's purpose in analyzing all of these lists was to find which books would be good for discussion groups. I had not thought of that. Take a look. He even offers a spreadsheet to download.