I just had to share this...
www.polycola.com (Formerly www.gahooyoogle.com) I tripped over this site a long while ago...back when it was still GahooYoogle. I guess the lawyers for Google and Yahoo had them shut down, but the originator is back with a new version. It's a search engine that posts the results of two search engines simultaneously.
See how you rank in google and yahoo side by side....or dogpile and AltaVista....or whatever you want.
Great site and lots of fun to compare search results with...Try some of your sites and see how you rank on various engines.