If you have an old laptop sitting around one thing you could use it for is to use it's screen as a second monitor for your main computer.  As laptops don't have any video inputs this is actually harder than it sounds, you need software running on both computers and have them networked.

On Windows there is a commercial option called MaxiVista.  On Linux there is a free option called Xdms.  If you want to do it cross platform, well you can't really but you can do something similar with Synergy by sharing the keyboard and mouse accross the computers.  If your latop is really old and slow you could try a tiny linux distro like Slitaz that runs completely in memory. (tazpkg get-install synergy)

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