TechWareLabs has published a review of the Vizo Propeller Graphics Card Cooler

The Vizo Propeller is primarily a video card cooler but can be used to cool any internal computer card. Of the many video card cooling products on the market today, most are designed to increase the air flow through the case and between card and potentially out the back of the PC case. The heat that is generated by your video card's graphics processing unit can itself cause a strain on its' own components. Newer generation GPU's such as the 7900, 8800, and ATI R600 based cards will expel more heat than ever before. Think Intel Northwood and old AMD Thunderbirds here guys. Other methods of heat elimination range from purchasing additional case fans (which in the end makes your case sound like a small Learjet), to higher priced water blocks.

Vizo Propeller Graphics Card Cooler Review