ThermalTake BlueOrb FX heatsink review
 

This heatsink features a temperature display and it also shows the noise level on the fan blades :
"ThermalTake has a new innovative CPU cooler, the BlueOrb FX. Just like the iFlash+ 120mm which I reviewed earlier this week the Blue Orb FX features one of the new LED fans from ThermalTake which display information onto the fan blades. The BlueOrb FX is even a bit more advanced, it doesn't only show the real-time temperature and a rotating ThermalTake logo, it also shows the noise level. ThermalTake calls the real-time temperature the T-Visuals and the rotative logo and noise level is branded as FlashCool.

http://www.dvhardware.net/review97_blueorb-fx.html