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.
Yes, you can use EJBs in a Struts application. There really is nothing special about integrating Struts and EJB. Just study how to write client code for an EJB and put that client code in an Action class or in some specialized class instantiated in an Action class.