a search engine that crawls the part of the web most concerned with current events -- news sites and weblogs and associated RSS feeds. Daypop crawls 59000 of these sites from around the world every day.
A Search engine for the "deep web". Contains useful Internet resources such as databases, electronic journals, electronic books, bulletin boards, mailing lists, online library card catalogs, articles, directories of researchers, and many other types of information.
Librarians' Index to the Internet (LII) is a searchable, annotated subject directory of more than 14,000 Internet resources selected and evaluated by librarians for their usefulness to users of public libraries.
a growing compilation of links to the search interfaces of resources that contain data not easily
or entirely searchable/accessible from general search tools . Material "hidden" from the general search
tools is said to reside on the Invisible Web.