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.
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