Mocavo.com is a genealogy search engine that you should check out. In addition to the sites it already searches, it recently added genealogy blogs.
This comes from the Macovo.com website: "Mocavo.com seeks to index and make searchable all of the world’s free genealogy information. While Mocavo.com discovers new sites every day, some of the existing sites searchable on Mocavo.com include genealogy message boards, family trees, state and local historical societies, the Library of Congress, National Archives, Ellis Island, Find A Grave, the Internet Archive, various U.S. state archives, and many tens of thousands of genealogy sites built by individuals"
check it out at http://www.mocavo.com/