@BlenderAllDay: These red dotted lines… I wondered once how somebody could be so precise to select exactly the camera area.
That’s the Render Border. [CTRL B]. If you have no Render Border defined but activate it any way, Blender assumes the render is limited to the whole camera area, or else unlimited. The option is in the Render tab, Dimensions panel. Uncheck the “Border” option. The red dotted lines will go away.
But that’s not what prevents you from selecting the camera. The camera is only on the 1st layer and you should be able to select it if you are on this layer. It doesn’t work on the other layers… by design. To be honest, I’ve never been much bothered by this limitation, I use “Lock Camera to View” all the time. The checkbox is easier to reach than the dotted lines around the camera view. Any way, according to my experience, the camera selection works as expected (on my Blender 2.69-rc1-beta1-whatever).
Now, the objects on several layers. That’s a feature of Blender. When you use [M] to move an object to another layer, you can use [SHIFT LMB] to put it on several layers at the same time. You can do the same in the Object tab. (The orange cube.) It’s supposed to help you to keep things organized in layers without having to actually copy anything in between layers.
You’re just not supposed to confuse yourself with multiple copies of an object spread over different but overlapping layer sets. (You have an empty on layers 1, 2, 6 and 20… and a copy of it on layers 1, 6 and 20 only.)