Planetarium simulation software seems to have come a long way from the opto/mechanical starballs of my youth. This quick video shows some of the amazing, real-time (as in, nothing shown is prerendered) astronomy simulation software being used in the some the largest planetariums in the world such as the American Museum of Natural History (Manhatten), California Academy of Sciences (San Francisco) and InTech (in the UK).

Looks better than most of the stuff I've seen on NOVA (and a good chunk of Hollywood movies too).