CueCat. It was a "free" barcode reader mailed out to everyone and their mother, given away for free at RadioShack?, intended for marketing evil but subverted left and right for geek fun.

From http://www.digitalconvergence.com/:

"DigitalConvergence had a colossal dream. The dream was to connect items in the physical world to the Internet, automatically. ... that dream hit a bump in the road and the servers were taken offline. They will scan again..."