For large scale, long term generation projects… these guys look to have one of the best VAWT designs…
http://www.tmawind.com http://peswiki.com/index.php/Directory:TMA_Global_Wind_Energy_SystemsFor smaller scale projects, this one looks promising…
http://www.pacwind.net/products.htmlThis site lists a whole bunch of different VAWT generators… a lot of them are small roof mount types. While the roof mounts are interesting, there’s a lot of questions about creating viable site plans as well as long term durability of the installation (these things tend to vibrate).
http://www.ecobusinesslinks.com/vertical_axis_wind_turbines.htm