My current favorite web toy is LivePlasma. It’s been around a while, but if you haven’t seen it yet, it’s like a Flash version of those Rock Family Trees they used to have in Rolling Stone. It works with both music and movies. The fun part is that you can click around and keep exploring the connections to the connections of the connections.
For example, check out the map of Black Sabbath. You can follow the connections to Ozzy, Rainbow, Deep Purple, and so on and so on.
I wish the connections were a little clearer – right now it only shows you that there IS a connection, but not what or who the connection is. Hopefully they will improve on this. Other than that, it’s a great way to pass some time and play Six Degrees of Ozzy Osbourne.