This is cool: I found a similar web site a while ago but didn’t bookmark it, so here is a comprehensive list of Apple Ad movies.
Unfortunately it lacks some of the older ones, like the two guys networking their powerbooks on an airplane, or the lemmings one. But you can find some of the older ones here.
Instead of hitting the sites hard dl’ing all the movies, I’d like to recommned that you get this torrent that contains 165 Apple Ad movies, and will also spread the load among more people.
Also, if you know more places with the old ads – give me a hint.