I sure hope that everyone is using Ancestry.com family trees. I know that some people are not fans of ancestry.com, but I have had such good luck with contacts made there. I am a huge fan of the ancestry hints that are given. I have located so many missing census records through their "hints".
If you haven't tried it yet, when you are on the home page of Ancestry.com look about half way down the page to where it says "About this tree", then "View People with Hints". It lists all the people in your database that they have located records for. It is incredibly helpful!