We wondered if that was because the PowerMac G3 machine there was running a Farallon Skyline wirelessPCcard and Mac OS9, which the card demands, while the rest of the Macs on the network run OS X.
TrustedReviews has their review of the Sony Blu-ray-equipped media center PC, with the usual compliment of card readers, wireless keyboards, wi-fi, and TV tuners.