I have a old am2 board knocking about and a spare psu, thinking of hooking up a few 5850's to the thing,
The internet connection to my main pc is supplied via usb, so il proberly hook up a switch to the eathernet port on the main pc and use a crossover cable
Whats the best os/ drivers and software to do this with?
This;
https://bitcointalk.org/index.php?topic=65915.0BAMT is designed to do exaclty what you are trying to do.
Throw a few coins to the developer once it's up and cranking.