As one of those people who often likes title sequences better than the movies they introduce, I like this trend a lot. It’s also very Rise of the Image, Fall of the Word—except (of course) the word isn’t falling out of the picture, it’s falling in to the video frame. Words spinning and dancing, bumping up into pictures, emphasizing (or contradicting!) the voice-over track… mmm, good stuff. More animanifestos, please.
To answer one question Chris poses in his post: This kind of animation is still mostly done in Adobe After Effects, but I think the field is wide-open for something more mass-market. Some new iMovie to After Effects’ Final Cut Pro. Prezi could grow to meet this need, if they made the tool a lot more flexible—so it was built for making media, not just giving presentations.