Another one of my favourite challenges is Trish's Non Fiction Five Challenge which begins May 1st and ends September 30th.
Here are the rules.
1. Read 5 non-fiction books during the months of May - September, 2010 (please link your reviews on Mister Linky each month; Mister Linky can be found at the beginning of each month on this blog)
2. Read at least one non-fiction book that is different from your other choices (i.e.: 4 memoirs and 1 self-help)
If you want to join in the fun, then pop over to Trish's blog Trish's Reading Nook and join in the fun.