Yahoo has the most comprehensive and well-organized subject directory to Web resources. A great portal and useful search site. Virtual Search Engines Lists new search engines by category. A great multi-engine search site. Can also search Usenet, FTP sites, newswire services etc.
Inference Find Very impressive site.
Searches the major search engines simultaneously, merges the results, removes duplicates, and groups the hits into broad categories by types of site. Ixquick Very fast meta search engine. Searches over a dozen major search engines simultaneously, brings the top 10 from each search engine, and prioritizes results. Also does news, MP3, and pictures searches. Searches nine different services i.e. Open Text, Lycos, Webcrawler, Infoseek, Excite, Inktomi, Alta Vista, Yahoo, and Galaxy, and organizes the results into a uniform format for display.