The invisible web, or deep web, is estimated to be 500 times bigger than the searchable web and comprises databases and results of specialty search engines that the popular search engines can't index.
This is a top-notch new kind of search engine (Web 2.0). My test case for searches is "film theory" as the search term, and such a search brought me many new resources I was previously unaware of.
upgrade July 06; essential site for film and media syllabi, annotated journal roundups, and inventory of college media programs; new category for posting articles