The Iron Giant by Brad Bird. Cool movie. Better than I anticipated. In fact it was one of the best feature animations I've seen, should have seen it years ago. It can easily compete with modern Pixar material.
And here's The Making Of The Iron Giant - Part 1 of 8
(The same Youtube channel has also many other animation making ofs, check them out if you're interested. I love the internet.)
And here's what's still left from it's website:
It's not bad really, there are some interviews and drawings and so on...