It is really not up to date, its some older stuff like some if his speech in 1997, and the 1984 commercial, and the cube intro, but nothing like the new imac. There is a place to get all the commercials for the Macs. I'll get back on that but I'm sure you are looking for the speeches.
This site doesn't have the iMac introduction video, but it has the iBook and PowerBook into videos, as well as many apple commericals: http://asp.cis.pitt.edu/thinkmov.html