http://www.colorado.edu/physics/2000/applets/satellites.html

Kind of fun. See if you can create stable orbits. I ended up bombing earth a lot. I also thought a physics department would know the moon doesn't orbit the poles, but hey...

-Zeke

I got a successful orbit - after many many tries. It doesn't look very stable though, its elliptical and the moon is influencing the orbit. Very entertaining.