ADConnect, a $79 DVI to ADC Conversion Box

From Formac, "Connect high-quality ADC displays to any Macintosh or PC with DVI interface. Or use ADConnect to hook up a second ADC display to your G4 Mac (graphic card with dual monitor support for DVI and ADC interface required). Only one small box that combines DVI video, USB and power." The same capability from Apple or Dr. Bott costs $149.