For some reason, I found myself reading the Duck Typing entry in wikipedia (which is sort of like watching a slow moving trainwreck). Of more interest was the Talk page. If you get a chance, I recommend you read both - and after your done laughing, take a look at my previous articles (rants?) on the subject - typeducking-on-duck-vs-static-typing and schrodingers-type-is-a-namespace-a-box.
I think I won in the reference material section. Although I don't think I am going to touch the wikipedia entry with a 10-foot-pole.