All the movies are great, but you really need to READ "Fear and Loathing on the Campaign Trail" or his Hell's Angel's books to really appreciate the man. In keeping the tradition alive...
I wouldn't even read this unless you have a real good sense of humor:
http://www.consumptionjunction.com/home.asp
Although, I consider it some of my best work.
It's offensive as shit, but it makes a point.