The new MacBook, MacBook Pro, and MacBook Air each have a Mini DisplayPort that
allows you to connect an external display or projector using an adapter. You can
use an external display as your main workspace or to extend your desktop, or you
can work in mirrored mode with a projector so you can view what your audience
sees.
Use the Mini DisplayPort to Dual-Link DVI Adapter to connect your MacBook, MacBook
Pro, or MacBook Air to a 30-inch display that includes a DVI connector, such as
the 30-inch Apple Cinema Display HD, and enjoy the ultimate widescreen canvas
with a resolution of 2560 by 1600 pixels.
Compatible only with MacBook, MacBook Pro, and MacBook Air with Mini DisplayPort
and Mac OS X v10.5.6 or later.