[@KoL] I also wouldn't want to teleport to a sword that someone has I dunno, stuck into a tree. I like the simplicity of "there has to be nothing there for you to be allowed to teleport there, no sticking yourself inside another thing". Seeing a Virtual World doesn't need air, we don't even have to worry about displaced air.

That said, I do like the beacon idea, as that is a nice upgrade path idea.