Try the Zalman TNN500A - The Whole Case Heatsink (Score 1)

http://www.zalmanusa.com/ (Go to Zalman TNN500A, couldn't get a direct link due to flash menu system)

This thing is a triumph of brute force engineering, but also extreme elegance in design. Basically THE ENTIRE case is made from Aluminium between 5mm and 7mm which is connected using heatpipes to the graphics card and CPU and simply dissipates the heat output passively into the surroundings. You can use the latest parts, the dissipation is rated up to 150W CPU heat output and 50W GPU output. The PSU uses VERY high quality components and is totally fanless. You can get a UPS system built into the bottom as an option as well. I think Athlon64 and Pentium4 CPUs are currently supported.

This idea of using sound to create sound is a no goer in a recording studio where the control room needs to be completely silent and presumably countless scientific and engineering applications. You could have the PC in another room, but this would definetly be prefferable for the majority of users.

Yep, its seriously expensive (not sure, maybe up to GBP1000), but it works flawlessly, looks great, and is ideal for conditions where complete silence is a must, not just noise reduction. Compared to other bits of kit that probably will be sitting in the same area (5000 Vintage Mics or a soundproof room) its a small price to pay really.