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.
Parameters are String values that are submitted (either on the URL or encoded in the post data). Attributes are objects of any type that your code, or the Struts framework, can attach to the request. You cannot add, edit or remove Parameters, but you can do this with Attributes.