What are the best live camera streams?

I was watching the ISS Live Cam [0] today for the space walk and I got to thinking: what are some other good live cams out there? I'd love to make a little program that cuts between a few of them every once in a while, or if something cool is happening on them (a good MV project if there ever was one!).

Thanks!

[0] https://www.youtube.com/watch?v=DDU-rZs-Ic4