Design Patterns (Gang-of-Four, Addison-Wesley)

Having seen this work recommended quite a few times, I ordered a copy of
the 1995 version (I found out about the 2005 version too late, shame!) and
upon reading I found my knowledge of several OOP principles is rusty at
best.

My library hasn't got anything thorough on OOP itself (That's what you
get for living in a small town), so I consider making an additional
(virtual) trip to the bookstore.

Those of you familiar with the contents of my latest purchase, can you
recommend a good OOP resource I could consider a good buy?

Should it be of interest somebody else:
In the Netherlands, bol.com sells the book:
Design Patterns: Elements of Reusable Object-Oriented Software
(Addison-Wesley Professional Computing Series) by Erich; Helm, Richard;
Johnson, Ralph; Vlissides, John Gamma (Paperback - 1995)
at EUR 50.99

Amazon sells the same book at US$ 40.19

bol.com also has the 2005 edition:
Elements Of Reusable Object-Oriented Software:
And Applying Uml And Patterns, An Introduction To Object-Oriented Analysis
And Design And Iterative Development
Erich Gamma & Craig Larman
at EUR 89,99

Amazon's site doesn't list this one.

> Those of you familiar with the contents of my latest purchase, can you
> recommend a good OOP resource I could consider a good buy?

"Patterns of Enterprise Application Architecture" is a nice one. See
http://www.martinfowler.com/books.html#eaa

Best regards,
--
Willem Bogaerts

Application smith
Kratz B.V.
http://www.kratz.nl/