I have been attaching my 23" Cinema display (with a standard DVI port) to my older MacBook Pro. Works fine. and I can move from one screen to another b just mousing to the edge of one screen and the pointer pops up on the other screen. As fr as the connector is concerned, find out from the Apple web page what adapter works for you given the type of both ports. I believe there is a special adpater to go to a new mini-DVI port. Try Googling to find it.
MamaMoose