As a software developer, desktop space is at a premium. I strongly prefer dual monitor setups because I can usually code in one screen and test in the other. For this reason, I've often shied away from doing any serious development on a laptop (at least one that isn't docked) because of the single-monitor constraint.
That is, until I saw the gScreen Spacebook:
Now that's the stuff of software developers dreams (even if it is in the neighborhood of $3000)!