The top of the case (looking very blue under flash).
The fill-port is visible on the top, and on the left we can see the four knobs of my fan controller.
At the moment only two of them are being used to control the speed of the two 120mm rad-fans.
If I crank them down to 0 and run the rad passive, the case is almost dead silent. However, even with them on full blast the hard disks are still the most noisy component. =]