Hi Tanuj,
I'm an EJB newbie too! I have started with EJB 3.0 There is no reason to read for EJB 2.0 To be more specific I'm studying from EJB 3 (Orreily) and EJB In action. Orreily's book so far gives an exetended perspective of using annotation (EJB 3.0) and how to use deployment descriptors instead for annotations. Both books mention if there is something to know from EJB 2.0
If you want to take my advice
you should start with EJB 3.0
Regards,
Nicolas
SCJP 6.0 , SBCD (Preparing..),
MSc Enterprise Systems Development, BSc Computer Science