WEll, I posted links to the start of this a long time ago, but since the 5 part series is finally complete, I figure I will just repost links to all 5 parts....
http://online.securityfocus.com/infocus/1550
http://online.securityfocus.com/infocus/1561
http://online.securityfocus.com/infocus/1574
http://online.securityfocus.com/infocus/1584
http://online.securityfocus.com/infocus/1597
The wonderful life of a system admin gone security pro....