Brainwave Generator
Make your own binaural tracks with the Brainwave Generator Software (shareware). A fantastic resource for those interested in meditation, astral projection, mind-body healing and general consciousness-exploration!
The Monroe Institute
Robert Monroe wrote several books about his out of body explorations, and established the Monroe Institute to carry out scientific research into the phenomenon. As a result, they have developed a wide range of binaural-based audio recordings, and there is much information about this work on the Monroe Institute site.
Centerpointe
Centerpointe is the home of Holosync, one of the best known audio programs to use brainwave synchronisation. Find out more on their site.