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.
Apache webserver = webserver Tomcat = servlet container, but some say 'application server' since it hosts 'web applications'. Since you can host web resources such as HTML, gif, css etc. from Tomcat as well, tomcat can be used as both, but it is primarily servlet engine (or, an application server).