GWIZAH: Great find!
MPJA also has a DC-DC converter that should work perfectly with the fan. The only thing that I don't know for sure is if the serial port can provide enough current to power this.
This has a 200ma output. I just measured a 12v Lasagna fan at 9.3 volts. It pulls about 34ma. The fan starts consisantly at 9v. The starting threshhold is in the 5-6v range (depending on the individual fan). I would not trust running one of these fans at 5v.
The best thing about running the fan at 9v is that it is about half as loud as at 12v. I've been "undervolting" fans for years without any problems. The only drawback is that you give up a bit of cooling capacity.
If you plan on overclocking or running a known "hot" CPU, buy one of the Tennmax i-Opener specials. This is one of the best solutions out there. If not, you can't beat the price of this pair of parts at MPJA.
Electronics run on smoke, if you let the smoke out they won't work