Here is a digital first, and yet another way a digital camera can be used. This picture of Obama was taken with a digital camera and is the first “official portrait” of a president-elect to be taken with a digital camera.
It was taken with a Canon EOS 5D Mark II. You can see all the settings here.
The picture is credited to Pete Souza, but should automatically be in the public domain because Souza is working for the federal government when taking the picture.