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.
Personally: Always the Request Object. Putting transient data on the session wastes resources and can cause problems if the data isn't handled properly. The Servlet context is shared across all servlets and is therefore not thread-safe. Dave.