Those are fantastic. This would be a great way to do a budget "about" video for a startup. Get a decent voiceover with a script, then have your designer do one of these videos.
I have a very minor claim to fame in that I appear in the background of one of the RSA animations (at about 6:45 in http://www.youtube.com/watch?v=nJmGrNdJ5Gw - and the nasty words about Perl coming out my mouth are not mine :-)
I admire this method of conveying ideas and information (animation). It's a great way to consume these clips.
The RSA has a whole series of 10 minute lectures which they animate on a whiteboard in this style. The illustrations are brilliant.
http://comment.rsablogs.org.uk/videos/
(search for RSA Animate)