Google | Perhaps the most popular search engine.
Invisible Web Directory | A guide to the best websites not found by contemporary search engines.
Yahoo! | A search engine based on a directory.
Article Searching on the Web
Find Articles | Claims to index five million articles not found by typical search engines. Includes many articles available for free on the Web.
Image Searching on the Web
NYPL Digital Library | A large selection of images from the New York Public Library collection.
Yahoo! Image Search| One of the best image search engines on the web.
Other Search Engine Resources
Search Engine Showdown | News and tips related to using search engines.
Search Engine Watch | Focused on search engine marketing, but it also includes news and tips on searching.