Depends how you want to use it. For example if you want your camera to do a perfect circle orbit. Parent it to a null. Set the null a distance away from the cam. Now rotate the null. The cam will now orbit it.
I always move a camera by parenting it to a null and keyframing the null so the cam has all of it's parameters always clear for keyframing independantly. I also turn off the camera's auto orient function so it's not always trying to look at the POI.
Chris Smith
http://www.sugarfilmproduction.com