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.
You should be concerned about that if you're planning to get into SAP as a developer. If you plan to be a consultant or work on a particular domain, you are largely insulated from J2EE etc. I think ABAP is the language used to customize SAP.