Where could I find old keynote videos, such as Macworld 2000 and 2003? All of the sites that had them seem to have been gobbled up by Apple's legal department. Is there anywhere I can download them?
There is a thread on this topic here. It's been turned into a Guide here.
Unfortunately, many of the links have broken, but there is still active discussion on keynotes in that thread, so it's probably best to keep it all over there.