Ooh, yes. This is a topic of great interest to me, because I came to fan-made videos through AMVs, and have noticed what seem to me to be culture differences between the two. It's been interesting trying to untangle the differences, stylistically and demographically.

(Also, thoroughly seconding your rec for Skittles. I was at Anime Expo the year it was in the AMV contest there, and seeing it on the big screen was mindblowing. And I hadn't yet seen Haruhi at the time, although now it's one of my favorites.)