There is an even better story about reading the screens of people using VGA cards at a distance by post processing the emissions coming from them [1]. Of course it is always fun to have your computer do things in interesting an unexpected ways.

[1] http://www.eskimo.com/~joelm/tempest.html used to be a page that had links to code that was used for reconstructing a vga image on your screen from picking up passive radiation, it has sadly gone away.