The generics tutorial I mentioned earlier, has now been released on the web (in pdf format).
It was written by Gilad Bracha, the spec lead for JSR -14 which created generics. If you want to understand generics, this is a great place to start.
Generics Tutorial, as promised
Books
Comprehensive coverage of Ruby 1.8 and 1.9
"The New Most Important Ruby Book"
Peter Cooper,
rubyinside.com
Completely updated for Ajax and Web 2.0
"A must-have reference"
Brendan Eich,
creator of JavaScript
The classic Java quick-reference
