The developerWorks WebSphere zone has a feature called Meet the Experts. Each month a different expert is featured, who accepts questions from readers within a particular topic area and answers them.
I'm this month's expert. (Makes me think they must be running out of experts. :-) Not too surprisingly, my topic area is J2EE architecture and design. So, check out my answers and leave me a comment here if you'd like to discuss any of these issues some more.