I use Ultra-Mon. I got it off BitTorrent, by the way. It's a very good product and should help you with your problem. In my opinion, the best feature on it is buttons added to the top-right hand corner of applications that can either stretch the page between the two monitors or switch the page to the other monitor. Using the latter button, the next time that you open that particular application, it will open on that monitor.
The question is not who will let me, it is who will stop me.