The Active Thermal link Lasher provides has some really interesting products. I wonder about cost. Middle Atlantic Products also makes fans for gear racks. In other threads, Gonk (I think) suggested a chimney-type cooling arrangement.

I have 5 3.25" fans from Parts Express that were less than $10 each. They are wired into a box with lighted rocker switches. Inside a cabinet open only to the front, a fan will drop the temp on top of an amp from over 100 degrees to 80 degrees within 30 seconds. When everything else is quiet, the fans can be heard, but I have never been bothered by the fans while listening to a movie or CD.