Hi,
I've been using WSAD for the last 5 months and that helped me a lot in my preparation. I've not done any MDB development with WSAD. There were a few questions on the
test on the above. In addition, if you are familiar with trouble shooting snd tuning with WSAD it will help you.
These are the books that I referenced.
Enterprise JavaBeans - Manson Haefel
IBM Wbesphere 5.0 Application Server by Wrox
SCWCD Exam Study Kit by Manning
and some IBM red books.
Regards,
Saliya