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.
You can run two tomcats but they will have to be configured so that they don't interfere. You can have them listen on different ports or you can have them configured to only respond to specific IP addresses. See