looking for a good introduction to OOP

[Neuruss]

I assume that you already know the basics, but if you're just starting
out and you need a very clear, simple and real life example of OOP
concepts in action, I suggest Alan Gauld's online tutorial (see third
post above).

He introduces OOP with an example of a banking application. 
This was just what I needed to make the mental "switch" to understand
OOP.
I think this example is an excellent one for somebody new to OOP
concepts.

http://www.freenetpages.co.uk/hp/alan.gauld

By the way, thanks Alan!