Great Erich Gamma Interviews 
There is a great
five part interview with Erich Gamma over at
Artima. It is the best discussion of Design Patterns that I've read. I suppose that after ten years of talking about the subject he's getting very good at it.
I especially liked the comment about all of the patterns starting to look like the Strategy pattern. I had the same observation myself. In the end, it's all about polymorphism.