http://www.cs.colorado.edu/~tuna/xearth/
which has links to other platforms including a Mac version
http://www.dtek.chalmers.se/~d2linjo/mac_xearth.html
The Mac page has a rather nice animated gif of a rotating globe of the earth which I haven't linked to because I don't want to annoy their ISP.
Typing this at the kitchen table while eating a gammon chop & tagliatelli in tomato & onion sauce, one of my more successful culinary efforts. I do like WiFi...