This week's book giveaway is in the General Computing forum. We're giving away four copies of Arduino in Action and have Martin Evans, Joshua Noble, and Jordan Hochenbaum on-line! See this thread for details.
The most basic difference between Tomcat and Weblogic is that tomcat is a servlet container and Weblogic is a full-featured J2EE server. Weblogic also has a number of tools to facilitate the development, deployment and maintainance of applications.