The Mobile Genealogy Society offers a link to Mocavo, which bills itself as the largest free genealogy search engine.
Search sites include genealogy message boards, the Library of Congress, National Archives, Ellis Island, Find a Grave, historical society and archives and many other sites.
A search for our great-great grandfather Samuel Simmons of Alabama returned 17,949 hits, but when we typed in our unusual Italian surname, a much more manageable 295 hits were returned in less than 2 seconds.