EtherPEG was a program that sniffed for JPEGs passing by on the AirPort networks at MacHack, and showed them on the huge screen to shame people into a) turning the 802.11 encryption on, or b) reducing amount of pr0n they download at weirdo Mac conventions. DRIFTNET can do the same for *your* office, and make an attractive desktop accessory to boot. The program promiscuously sniffs and decodes any JPEG downloaded by anyone on your LAN, displaying it in an attractive, ever changing mosaic of fluffy kittens, oversized navigation buttons, and blurred images of Big Brother Elizabeth fiddling. It's UNIX only. Your sysadmin is undoubtedly running it already. So stop that. Now.