This is one of several posts I originally made in 2005. Some of the specifics have changed, including the focus of my work from "some design and a some programming" to "full time web development". In general their message remains valid, so they're worth keeping around.
Six Dumb Ideas
Bruce Schneier of Crytpo-Gram and other fame links to a really interesting article by Marcus J. Ranum on “The Six Dumbest Ideas in Computer Security”.
Schneier’s blog entry: http://www.schneier.com/blog/archives/2005/09/marcus_ranums_t.html
Ranum’s article: http://www.ranum.com/security/computer_security/editorials/dumb/
Both are very interesting reading for anyone that owns computers, whether or not you adminsiter them for a living.