Yeah, I've read about that short and it's influence on Lucas and THX, but I've never seen it. Cool... didn't know about the cell-nr homage or it never crossed my mind. :)
Edit: I found it http://www.nfb.ca/film/21-87/
Quite brilliant I must say, you can clearly see and hear the influences it had on Lucas, also Walter Murch's sound design. Thanks for the heads up skyjedi, I've wanted to see that for a long time, and know I stumbled upon it immediately. ;)