Do you have an old laptop lying around? You know the kind, it doesn't run that fast anymore, and you have to keep it plugged into the wall at all times. Why not turn that laptop into another monitor for your desktop?
This guide shows you how to do just that. It's actually pretty cool, but I'm not sure that I would put forth that much effort just to save a few bucks. Plus you pretty much destroy a decent laptop.
I really must commend this guy for actually going through with this. It looks like a lot of work, and it apparently works pretty well in the end. I think I'd rather just use an old bulky CRT if I were really desperate for another monitor.
Use a laptop LCD to extend your desktop display [via hackaday]