The bright side is that you won't have to put up with that annoying "click" sound they added in the latest OTA update!
On a more serious note, once I believed my camera was totally fubared because all I could see was black. It ended up that I'd accidentally switched to the front camera, and was holding the phone with my finger over the front camera lens. In my case, I could see the various controls and things on the screen, I just had black coming through from the lens. Do you see the zoom bar on the left, and the various menu buttons on the screen?
Have you tried getting to the camera both through the apps menu, and by firmly pressing down the camera button when the phone is powered up?
Does the video camera app work? Since you say "camera", I assume that you are talking about the still camera.