A Dummies Guide to Kaminsky Cache Poisoning
There's a great Illustrated Guide to the Kaminsky DNS Vulnerability that just about anybody can understand over at Steve Friedl's Unixwiz.net Tech Tips.
It's a great place to start if you don't already know enough about how DNS works to understand how the exploit could work.
The web page takes a look at the way DNS works so you understand what's going on and then delves deeper so you you can follow how the vulnerability could be exploited.
The page also includes a number of useful links such as Dan Kaminsky's Black Hat presentation.
