This week's giveaway is in the EJB and other Java EE Technologies forum. We're giving away four copies of EJB 3 in Action and have Debu Panda, Reza Rahman, Ryan Cuprak, and Michael Remijan on-line! See this thread for details.
A short look at the tutorials for Servlets and JSPs should answer the first question. A Servlet is a java class, whereas a JSP is an HTML page with some Java code embedded in it. An application server turns a JSP into a Servlet before running it.