Kanex has launched the US$99 Kanex iAdapt C30 (http://kanexlive.com/products/iAdaptC30.html), a MiniDisplay Port to Dual-Link DVI-D adapter. It extends MiniDisplay Port equipped Macs to 30-inch displays, such as the Apple Cinema Display.
Dual-Link DVI-D purportedly offers a higher-quality image than standard DVI due to the nature of the digital format. The current 30-inch displays on the market supports a maximum resolution of 2560×1600.