Popular Science readers: Please note that I have nothing to do with these companies, and so I can’t send you information about them. Please visit their websites instead.
Windside: http://www.windside.com (Finland) and Windaus Energy: http://windausenergy.com (Canada; site doesn’t render properly in Mozilla): both with near-identical twisted-savonius designs. Oh yeah, and a nice line in carping at the rest of the wind energy industry:
There are no flying ice blocks, leaking oil or cutting blades. (Windaus);
Most turbines don`t simply work. There is one turbine, which works. (Windside).
It should be pointed out that Savonius designs, being drag devices, are much less efficient than standard three-bladed horizontal-axis machines, which use lift. If you need a design without guywires, take a look at the Proven Energy machine. It’s very solid, and Scottish, too.
One has to wonder about lone voices in the wilderness. Once they start to drown each other out, it gets hard to tell which are the real deal, and which are not.