[Hansfragger]

Cool idea. (yuk, yuk). Cooler master implemented this principle in their Dual storm fan. This is from their site.

The basic process of CPU heat dissipation using an axial fan involves the air pressure and volume produced by the fan to exchange heat from the heat sink. However, only the furthest side of the blade from the axle produces the most air pressure and volume, creating an undesired "blind spot" because it is unable to blow towards the center of the heat sink, which is the hottest part of the heat sink. Dual Storm, with dual-layer fan blades, blows with opposite rotating direction, reducing the blind spot at the center and thus improving cooling performance. Similar to the Jet engine's compressed air principal, dual-layer fan blades increase air pressure, an excellent choice for heat sink with high density fins catching up with the latest trend in the market on high density fin heat sinks.

Sounds good in theory. This is the kind of post that makes reading forums fun. Good job.