Well have you tried the new Google genealogy re-search engine? Mocavo is being highly touted by popular genealogy blogs like Dick Eastman as a great new tool for family history research.
I love the idea of being able to research "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" all at once.
However, I am ambivalent about searches into paid databases. If you are searching and you hit something you can't access it can be frustrating.
My own searching experiments have had limited success. However, I did find an interesting digitized site for the Charleston 1861 city directory
But, of course, I will keep this search engine high on my list of online resources and keep you up to date about successful search strategies.