Jack Lynch's Online Literary Resources:
http://andromeda.rutgers.edu/~jlynch/Lit/
A thorough and well-organized set of links to just about everything
The Science Fiction Resource Guide:
http://sflovers.rutgers.edu/Web/SFRG
Everything about science fiction
The Book of Gods, Goddesses, and Other Characters of Mythology:
http://www.cybercomm.net/~grandpa/gdsindex.html
An Index of Websites on Modernism:
http://www.modcult.brown.edu/people/Scholes/modlist/Title.html