I watched the 2 Btvs ones and lololed! Especially the "Fact of Life" one. It's fun to think about what Btvs would have been like if the show fit this version of the credits.

Also, I followed the link you gave someone above, and just dl'ed American Edit. I am blown away! I had heard the term mash-up, but being chronically under a rock and in a cave, I didn't know what they were. So far, I am hooked, at least on Dean Gray. :-) I'm friending you, if you don't mind because I would like to be sure to see your posts on this kind of thing. Thanks!