I have mentioned before that I wish there were a way on a database site itself to track "results" that have already been viewed and analyzed. On sites where databases are "in progress" wading through the same results gets tiresome.
Another added feature I'd like to see (particularly on these databases that are updated) is the ability to send me an email when there are new results for surnames or searches in which I am interested. While I don't need an email every time there is a new Smith, I certainly would be interested in an email telling me there was a new Rampley, Trautvetter, or Ufkes result.