The way I did is simply use a danish "usb-skinne" (danish page, but with a picutre), that connect to usb and in the power itself. I do not known they exits in USA.
One such of product is on
http://www.mobilnet.dk/product.asp?product=39&sub=97&page=1, and the 75kr is about 12$ (but proplety cheaper in USA).
When I power off the machine, it simply power off all connected hardware, wich was used on it!
Just write the wikipage, some us other would simply shine it up.