Ive never seen anything like this. Its the largest collection of derailleurs broken down by manufacturer, type etc I have ever seen.
I bet you could (well if your a bike geek like me) spend hours on this site, bike geeking out over these little beautiful pieces of jewelry.
Check it out http://www.disraeligears.co.uk/Site/Home.html
Here are some of my favorites:
Awesome! A Huret Course Competition from the 1940s!

