Reference Sites and Indexes

Hot Sheet - Comprehensive links to the best the Web has to offer.
Wikipedia - Incredible user-contributed information source, a collection of human knowledge vaster and more responsive to change than any encyclopedia. But beware, entries have not been vetted academically
Virtual Reference Desk - Ready reference information. 
Fast Facts - Over 375 sources of facts and reference material. 
Infomine - University-level, net-based, research tools. 
All My Faves- This mother of all web-sites. is the greatest thing since the invention of the remote control!