Good guide on power supplies for arduinos

Before you go thru your junk draw and recycle some of the wall warts for an arduino, you may want to read up on this article first.

http://www.open-electronics.org/the-power-of-arduino-this-unknown/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+OpenElectronics+%28Open+Electronics%29