University of Florida
Pipe Organ Education Project: The Pipe Organ
This is an excellent site about the pipe organ and how it works. It also includes a "Glossary of Organ Terms."
Other
Historic Organs: The Organ in America: A Historical Sketch
This is the history behind the organ in America.
Other
Pipe Organs and Music
This site provides many pictures of organs around the world, with brief information on each. It also has lots of organ music to listen to.
Dallas Symphony Orchestra
Dallas Symphony Orchestra Kids: Organ
A concert hall organ can have as many as four keyboards, 244 keys, 32 pedals and 4,535 pipes. Use RealAudio or Windows Media Player to hear the organ alone or with the orchestra.