Another Non Fiction Challenge

I read books for this challenge from last year, so I think I will do it again.
Non Fiction Challenge 2008.
It's already started (as of May 1st) and will end September 30th. The idea is to read 5 non-fiction books in 5 months. Some of those books I have already read can be cross overs. Cool. The only rule so far is to read at least one non-fiction book that is different from your other choices (eg 4 memoirs and 1 self-help).