Two more good computer security
books:
Information Warfare, by Winn Schwartau - lots and lots of
cool stories. If you're just beginning to be
interested in the field, read Schwartau's Cybershock for a
good general-purpose introduction. Both are great for
just delving into at random for fun stories and
insight on how to rob banks.
Information Warfare
and Security, by Dorothy Denning - More of a
textbook, but this still has lots of fun stories. It's
particularly recommended since it quotes me :-)