Laura Milligan’s list of 50 Awesome Search Engines Every Librarian Should Know About is a handy resource, and not just for librarians.
Nicely organized into sub-groups such as Meta Search and Multi Search, Multimedia and Interactive, Great Niche Sites for Librarians, Custom/Reference searches and more, the post introduced me to many sites I’d never heard of.
Scirus for scientific information, GuideStar to help you find information about non-profits and Public Radio Fan for radio stations from around the world are just a few of the 50 on the list.