
Books
Black Holes & Time Warps: Einstein's Outrageous Legacy, by Kip S. Thorne, W. W. Norton & Company, 1994.
Gravity's Fatal Attraction: Black Holes in the Universe, by Mitchell Begelman and Martin Rees, Scientific American Library, 1998
Other books with good information on black holes:
The Hundred Greatest Stars, by James B. Kaler, Copernicus Books, 2002
The Physics of Star Trek, by Lawrence M. Krauss, BasicBooks, 1995
Time Travel in Einstein's Universe, by J. Richard Gott, Houghton Mifflin, 2002
Web Sites
Cambridge Relativity: Black Holes
Chandra X-Ray Observatory: Black Holes
Imagine the Universe: Active Galaxies and Quasars
Virtual Trips to Black Holes and Neutron Stars
Other websites with good information on black holes:
Encyclopedia of Astronomy and Astrophysics: Institute of Physics Publishing