From Genea-Musings: <blockquote>The one with by far the most web sites searched is at MyHeritage - http://www.myheritage.com/.
You have to register to use the site, but it is free. You can input a
given name and last name and the search engine will look in over 900
different databases. It takes a little time to do this, but for a
unique name it might find just the database you haven't found yet. Many
of the databases surveyed are commercial for-fee sites, but at least
you get an idea that some information may reside on those sites.</blockquote>