This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
Since no-one is biting, I'll do some shameless self-promotion: JBoss in Action, chapter 14 is all about Java performance tuning. This covers mainly heap monitoring and tuning, it does not get into code optimization.