Pelagic Shark Research Foundation (PSRF)
http://www.pelagic.org/index.html
Information on shark biology, research, local (California Central Coast) conservation efforts, as well as descriptions of local species of sharks, a library of shark pictures, etc.
SHARK-L archives web interface
http://raven.utc.edu/archives/shark-l.html
From which you can browse or search the archives of the list using a SEARCH command, e.g.:
SEARCH megaladon in shark-l
SEARCH * in shark-l where subject contains attack
Sharks (Fiona's Shark Mania)
http://www.oceanstar.com/shark
Lots of pictures (including clip art you can use at your own site), true stories, sharks in literature, mailing list info and the most comprehensive list of shark links on the Web.
Sharks
http://www.ncf.carleton.ca/~bz050/
Follow the links you want, including the shark page with a comprehensive and entertaining tour de force through the world of sharks- from white shark predatory behaviour to giant nurse sharks and weird fossil sharks; other links include giant squids, marine biology and cryptozoology.
Whale Shark bibliography
http://scilib.ucsd.edu/sio/indexes/whalshrk.html
An annotated bibliography on the whale shark, published in 1981 by the late Fay H. Wolfson and Giuseppe Notarbartolo di Sciara (Atti Soc. Ital. Sci. Nat. Museo Civ. St. Nat. Milano, 122(3-4):171-203), courtesy of the Scripps Institution of Oceanography Library. 345 entries are listed and annotated (to October 1980).