The Death and Life of the Great Lakes by Dan Egan.  Continuing on my theme of books about bodies of water — this was much more compelling than the Gulf book.  Partly because of my familiarity with the Great Lakes, partly because there was a very strong story in this book that was new to me.  I knew about the pollution issues in the Great Lakes before the EPA, but I never new the story of invasive species and the battles that have been happening.  Very interesting.