Sometimes, one good computer just isn't enough. But when all you've got is one good one (and the rest suck), you can patch your XP Pro (sorry, no Home or 2K) to support multiple simultaneous logins via remote desktop.
Originally, this was an involved process. Our friends at Sala Source made it easy. Download the patch from http://sala.pri.ee/?page_id=11, install it, reboot, and feel the joy. This is a HACK using a beta version of the terminal services software, so use it at your own risk.