Nikon is trying to get a patent on their new double viewfinder technology to be possibly implemented on both professional and consumer DSLRs. Within the optical viewfinder, the user will be able to see a small electronic display. The person will be able to zoom in and out and also switch between the two.

More information can be found at:

http://www.photographybay.com/2008/05/10/nikons-new-viewfinder-does-double-duty/