I find in recent versions (2.69a, 2.7, 2.71) of Blender that I cannot append lights or cameras from one ~.Blend file to another. The documentation suggests that this used to be possible in versions prior to 2.5, but there is no documentation related to appending or liking for newer versions. Is it no longer possible to append lights and cameras from one file to another?
Just like how you cannot append an actual object from Mesh, you can't append scene objects from Lamp or Camera either. To append an object from another scene, you need to go into the Objects folder.