There is a tutorial on how to setup multiple monitors over at Multiplexpc.com - Affordable Multiple Monitor Computer Systems and Multiple Monitor Arrays for Day Trading and Business Professionals!
I have to agree with Forker, you gotta have a stable machine. I was researching building one on my own and then just ended up buying from Multiplexpc.com - Affordable Multiple Monitor Computer Systems and Multiple Monitor Arrays for Day Trading and Business Professionals!
Not a single problem...