This Java Generics FAQ is a whopping 433 pages in PDF form. Holy Moses! I went to print it out at work and was shocked by the size. The special cases are simply amazing. There's things that I hadn't even thought about it. It's comprehensive and well-written. 433 pages is a whole book on one small feature.
I've been using Java 5 at work and I must admit it makes developing proper frameworks possible, but it also complicates matters. It made my life as a framework developer nicer, but made the life of my user more difficult. Features should make my user's life easier, not mine. Simplicity is the key to good design.