Planetarium Net
The online meeting place for planetarium professionals. Includes articles, news, educational resources, and more for astronomy educators.
http://www.planetarium.net/

Planetarium Software
Links to many different kinds of software for several platforms.
http://www.seds.org/billa/astrosoftware.html

Planetarium Web Sites
A directory of worldwide planetariums.
http://www.lochness.com/pltweb/pltweb.html