Via TPMMuckraker, which has owned the US Attorney purge story from the beginning, the Washington Post has a neat graphic with the series of lists of attorney's up for a-purgin'.
The thing that jumped out at me was the November 1, 2006 list composed by Michael Elston, chief of staff to the DAG. Not one of the names on Elston's list (1) was fired, (2) resigned, or (3) appeared on any of the other lists.
Also, while I can't speak for the the other names on the list, both Chris Christie and Mary Beth Buchanan have been loyal Bushies. Very curious . . . I suspect this was a CYA list created to muddy the waters of any potential outside review.