Can someone direct me to the "perfect" AV closet cable management system? I am thinking I need a vertical channel on either side of the AV rack that allows easy addition and organization of the wiring. There must be a great solution for this common problem...

Cablemate

http://www.wiremold.com/www/consumer/products/baseboard_organizer/index.asp

The local Home Depots sell it....

You also might check out any electronics places that deal with computer supplies and check out their selection of rack wire management solutions.