Gefen is now shipping the ex-tend-it DVI Hub. The DVI Hub is designed for connecting dual flat panel monitors by doubling the DVI signal. The Hub also allows a flat panel and projector scheme for presentations, with cable sizes of up to 150 feet. According to Gefen:
Professional users can connect two digital flat panel monitors - or a combination of monitor and projector - to one computer using Gefenis ex-tend-it DVI Hub, which doubles a DVI signal then extends it using high-quality DVI cables capable of transmitting the digital signal up to 150 feet. The DVI Hub is particularly useful for those who want to view simultaneous images on multiple screens. When used with Gefenis DVI to ADC Conversion Box, many of Appleis digital displays can be used with the Hub and extended up to 150 feet.
You can find more information about the ex-tend-it DVI Hub at the Gefen Web site. The ex-tend-it DVI Hub is available for US$599.00.