I post my fair share (or perhaps more than my fair share) of videos around here -- heck, I even have my own irregulalrly updated YouTube video list -- but I'd be remiss if I didn't point out a couple other sites that deal in the world of video.
First off, I've been really slack in mentioning this, but Jitterbug is a kid-safe site for kids music videos. So if you like the types of videos I link to here, but your kids could do without all the other blah blah blah, I recommend heading over there for their growing collection of stuff to watch.
Second, Rock Tots is a newly-started collection of videos of kids playing music. It's as if "From the Top" ditched the classical focus and went straight to YouTube. OK, it's not really like "From the Top" at all.
So there you have it -- videos of adults making songs for kids, and videos of kids making songs for adults.