I just learned about this new Youtube channel.
Numberphile provides viewers a new perspective when it comes to numbers. From Googols and Googolplexs to Root2, this channel offers anyone the “Perfect Number”. Currently, they have a video on the sounds of Pi, here is the link to check it out – http://www.youtube.com/user/numberphile/featured
Here's a nice Numberphile video, very appropriate for Pi Day: "Professor Ed Copeland on a strange occurrence of Pi involving bouncing balls."