This week's book giveaway is in the Testing forum. We're giving away four copies of The Way of the Web Tester: A Beginner's Guide to Automating Tests and have Jonathan Rasmusson on-line! See this thread for details.
That is Duke. He is like a mascot for Java on the Sun sites. If you go through the tutorials he runs a bakery for Sun, they hang him (hangman == HangDuke), they use him in screen savers... and on the Sun forums he provides the cash that reward good answers (Duke Dollars).