which is the best available EJB book / tutorial available.
I think the book "Mastering Enterprise Bean" by Ed Roman is a good Book
Please send us the url of that EJB- books .
"Enterprise Javabeans - Developing Component-based Distributed Applications" by Tom Valesky is quite a good introduction to the whole EJB thing...
I would like to recommend Sun's J2EE guide. The guide for developer gives a good entry point for the EJB beginners. The most important thing is that I did not find significant errors in Sun's guide and it is for EJB1.1
you can find the best tutorial on www.java.sun.com/ejb
Best of Luck :-)