If you are looking for advice on how to build a homebrew wind turbine then
otherpower.com has a
goal to share all their results, whether successful or failures, free
of charge. Whilst wind is not their only power source, they do have a
good selection of designs available, and have a look at their
turbine test rig
- a model A Ford!
They also run a discussion board, and the
Homebrewed electricity
section has lots more info on home built (or home renovated) turbines.
Homebrew electricity turbines