http://www.youtube.com/watch?v=q9flSPAdOLk

It sure looks cool.

Helixwind’s manufacturer says it works at lower altitudes, is less of an eyesore, and is more bird-friendly than standard turbine designs, but many blog posters are demanding more hard data  before falling in love with the design. We’d suggest some research at  the AWEA site (you didn’t know that stands for the American Wind Energy Association?) before signing any purchase orders. 

The company has recently posted some PDFs containing more detailed specifications.