What you are looking for is called a SAVONIUS rotor.
This should get you started.

The Savonius Super Rotor
http://www.motherearthnews.com/Renewable-Energy/1974-03-01/The-Savonius-Super-Rotor.aspx

The Alternative Windmill [mostly pictures]
http://www.southcom.com.au/~windmill/

Micro wind power with a Savonius rotor
http://www.angelfire.com/ak5/energy21/microsavonius.htm

My Savonius Rotor - Making Electricity [4 meg pdf]
http://www.homesopen.com/wind/savonius.pdf

EXPERIMENTAL STUDY OF A SAVONIUS- DARRIEUS WIND MACHINE [pdf]
http://cere.udc.edu/Gupta.pdf

SAVONIUS ROTOR CONSTRUCTION [pdf]
http://www.zhn.cz/literatura/uzitecne_manualy/cd3wd/other/Savonius%20Rotor%20Construction.pdf

A homemade water pumping wind turbine
http://www.angelfire.com/ak5/energy21/savonius.htm

A new spin on an old twist.
http://www.instructables.com/files/orig/FAG/WAR7/BRBEYKVV73O/FAGWAR7BRBEYKVV73O.pdf

Building a Home Home-Scale Vertical Axis Wind Turbine
http://carbon.cudenver.edu/engineering/P...escale_vawt.pdf

Another Approch to Wind
http://www.memagazine.org/backissues/membersonly/jun04/features/apptowind/apptowind.html

_________________________
When in danger or in doubt
run in circles scream and shout
RAH

And always remember TANSTAAFL