General docs for PD are here and there are several other resources here.

Most of us know of noise canceling headphones as a way to block out noise, but the folks at ChatterBlocker.com are taking a different approach. ChatterBlocker "uses nature sounds, music and background 'anti-chatter' voices (or 'walla') to mask the intelligibility of unwanted conversations."  The premise here isn't to block out the sound entirely, but rather to render normal human speech unintelligible, thereby eliminating distraction.

Another interesting (and slightly creepy) application is the BrainWave Generator.  Research tells us that our brains emit different types of waves while we sleep, learn, etc.  By recreating these waves with the binaural beats made by this program, you can put your mind into whatever state you'd like (in theory).

who knows if either of these are viable programs, but they're nonetheless interesting to read about.

Also, a few details from today.  The Turkish composer I mentioned who was active with Davidovsky and others at the Columbia-Princeton studios was Bülent Arel (I said merely "B-A").  He is perhaps best known for having worked with Varèse on Deserts.  It is worth noting other composers who were active at Columbia-Princeton during the 60's and 70's; this is not a complete compilation by any means but shows how central these studios were for early electronic music.

Jon Appleton, Charles Dodge, Edgard Varèse, Vladamir Ussachevsky, Otto Luening, Milton Babbitt, Wendy Carlos, Harvey  Sollberger, Charles Wuorinen, Bülent Arel, Mario Davidovsky, Luciano  Berio, and Jacob Druckman

I also mentioned the first concert at the Center, one in particular with Davidovsky's first piece (it was his first study, not the third as I incorrectly said).

Ussachevsky’s Creation-Prologue
Arel’s Stereo Electronic Music No. 1
Halim  El-Dabh’s Leila and the Poet
Milton Babbitt’s Composition for Synthesizer
Mario Davidovsky’s  Electronic Study # 1
Otto Luening’s Gargoyles for Violin Solo and Synthesized Sound
Charles  Wuorinen’s Symphonia Sacra

A more thorough overview of the Center's development and details of what equipment and means were available during this time can be found here:

The Columbia-Princeton Electronic Music Center (links for PDF)

Karlheinz Stockhausen, 1928 - 2007