Whether you need to convert simple measurements or complicated astronomy figures, you'll be able to do it at OnlineConversion.com, an extensive site featuring hundreds of conversion tools.
If you need to translate something, you'll be able to do it with Lexicool. Over 7000 dictionaries and glossaries here in a wide variety of languages.
33. Google Maps
Find maps and directions at Google Maps; you can also check out locations in Street, Traffic, and Satellite views. Google Maps also periodically offers special features, such as maps for the Winter Olympics.
The Genetic Home Reference, a project of the National Library of Medicine, is a stellar resource for genetic information and information about genetic conditions.
Get demographic information about nearly any community in the United States at ePodunk, a fascination data collection for over 46,000 different cities, towns, and suburbs in the US.
Chronicling America is a project from the Library of Congress; you can "search and view newspaper pages from 1880-1922 and find information about American newspapers published between 1690-present."
Doing research on a company's human rights impact is difficult - unless you visit the Business and Human Rights Resource Center. This resource covers covers over 4000 companies in over 180 countries, and deals with topics such as discrimination, environment, poverty and development, labor, medical health, security, and trade.
BookFinder is a search engine for new, used, rare, out-of-print, and textbooks. Over 150 million books are available here; if you want to find something somewhat obscure, this is the place.
View full country profiles from all over the world; in addition to basic stats, the BBC also provides audio and video clips from their archives.
Need help on how to pronounce a word - in virtually any language? Try Forvo, the largest pronunciation guide currently online, with hundreds of thousands of words and pronunciations in over 200 different languages.