I watch children's educational music videos on youtube with my kids almost everyday. There's a lot of good stuff there. For example, Toddler World TV (
http://www.youtube.com/user/toddlerworldtv) is one of my favorites. The songs are written by Dr. Matthew J. Dorman (he's an ethnomusicologist), and his children's folk group is called The Little Blue Globe Band. I use Toddler World TV to teach my kids basic shapes, colors, etc. Check out The Flower Song (
http://www.youtube.com/watch?v=kBoHLbIicxY) -- it combines a lullaby with learning. Excellent. Another good youtube channel is Kidstv123. Lots of great content and original compositions. There are other channels, too. Make sure you scan the content first to make sure it's good for kids!