building a bike powered phone charger

Here are some links I'm looking at and trying to decide which one to try out first.

http://greenopolis.com/goblog/derekmarkham/7-great-pedal-power-plans

http://www.stewardwood.org/resources/DIYcyclepower.htm

http://blog.makezine.com/archive/2009/06/how-to_pedal-powered_phone_charger.html

http://www.instructables.com/id/Bike-that-charges-your-cell-phone-as-you-ride/