This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
Well in some ways, if you have a Java application that uses a single thread and you start using Spring Integration, you could make it use more of the CPU by adding some threads. If this is your only reason to use SI I'd say it's overkill because an ExecutorService will do the same for you.