saw one in a smp server. it didn't do anything, and i know it was client side.
i hope he does implement meteor showers, perhaps predictable by the moon phases, like if the moon phases are all forgeted up you know there's going to be a meteor shower? of course, they shouldn't set things on fire, but it'd be cool for them to just fly out of the sky. maybe they could drop a random naturally found stone or ore every time they hit the ground.