Basics of OO Programming Book reqd.

Hi,
I have been programming in Java for a while. But the programming techniques I followed are not that entirely of OO.
I feel that I have to really learn the concepts of Object Oriented Programming. Then after learning the fundamentals,I can use it in any OOPs Language.
I would like to have a book which is from the beginner's point of view.
with warm regards,

Arun.

This is a good book about OO by the Man, Grady Booch:
http://www.amazon.com/exec/obidos/ASIN/0805353402/ref=lm_lb_4/107-5469969-0321312