I like that idea Aelya. Plus, that gives clerics a possibility to resurect people from their bodies. The only problem is that if it takes too long to get out of the death plane, there\'s going to be a lot corpses laying arround waiting for their soul back. The 30sec invul could still yield problems though. For example, if there\'s a huge troll guarding a corridor or something, and you can\'t figure out a way past it, and you can\'t kill it, you could do the die and resurect bit, and then book it past. Granted the time in the death plane would probably make this really not worth the effort, but the potential for exploit is still there.
Invisible corpses would solve the camp problem, and the cluttering problem, but then clerics won\'t be able to bring people back. Or maybe they can, but they have to know the person, and communicate with them via spirit-talk or something to arrange it.
Another possibility would be to have people respawn at a temple, rather than at their corpse. But again, this keeps resurection from being possible.