I’ve got four systems hooked together through a Belkin KVM switch (fair at best, BTW), and I’m actually able to get two of them in a dual-screen setup. The middle screen is the one shared via the KVM switch. My main dev box, one I built last year when I started Iterative Rose, ties the middle and left monitors together. My nice laptop from NuSoft is on the right and is tied with the middle monitor. That setup isn’t the best since resolutions differ, but it’s a lot better than a single monitor!
Yes, yes, my workplace setup sucks, but sometimes you just have to put up with lousy stuff for the short-term. (OK, “short-term” has been the case for six years…) The current workspace, as you can see, is a hodgepodge of hacks trying to keep it as ergonomically friendly as possible. The entire setup is due for a replacement in a month or so, and the new setup is going to be seriously cool.