I've been looking for a few early animations to keep the troops interested and came across Norman McLaren, who I seem to have missed - he was well known for his work with the National Film Board of Canada.
I suppose I'm rather partial to some dots and spaces...
Another music video, sorry - but I very much like the way this one's been done, using data visualisation that you can download and use yourself from the video's page at googlevideo. Its clever stuff, and I reminds me of all the stuff I love to see at Info Aestetics. Please go and have a look at this site, it never fails to amaze me.