When new people find fieldlines.com they inevitably ask pretty much the same questions so this is an attempt to provide links to those questions in one easily found place
The most often asked question is probably "can I use a car alternator, induction motor, ect. For an alternator for a wind turbine. The link below should cover your questions on this matter quite well.
http://www.otherpower.com/otherpower_wind_alternators.html
The second most asked question is probably about controlling voltages to the batteries in a wind system for example "how do I keep my 30v tape drive motor from frying my 12v battery bank." The batteries will pull the generator voltage down to their charging voltage until they are full then the power needs to be diverted somewhere else. That is the job of a diversion charge controller.
http://www.bioelectrifier.com/charge.htm
http://www.homepower.com/files/shuntregulator18.pdf
http://www.xantrex.com/products/supercat.asp?did=333
Number three most asked is probably what kind of batteries should I use or some variation of the same.
http://www.otherpower.com/otherpower_battery.html
Probably not one of the most asked about subjects but should be is Efficient Lighting.
http://www.otherpower.com/otherpower_lighting.html
You can get good information on solar here.
http://www.otherpower.com/otherpower_solar.html
Here are some good links on hydro
http://www.otherpower.com/otherpower_hydro.html
http://home.carolina.rr.com/unclejoe/menu.html#Hydraulic%20Water%20Turbines
http://www.lcs.net/users/pinecrest/text/hydro.htm
http://myhydro.freeservers.com/
Good links on internal combustion generators
http://www.otherpower.com/otherpower_gas.html
http://theepicenter.com/tow02077.html
http://www.qsl.net/ns8o/welcome.html
http://www.webpal.org/
webpal/b_recovery/3_alternate_energy/electricity/lawnmower/generator/
generator.htm
http://www.homepower.com/files/mark8.pdf
if you have not looked through the otherpower.com main page links yet I would highly recommend that you do so.
http://www.otherpower.com/otherpowerfront.shtml
(links are at the bottom of the page)
overunity link
http://phact.org/e/z/freewire.htm