I think the real question here has always been whether or not you're at any greater or lesser risk of death by lightning in a hammock versus being in any other form of camping shelter or simply out in the storm.
And unless the shelter is a full structure, my personal opinion is that being in a hammock doesn't really increase or decrease your odds noticeably.
It's not any safer nor more dangerous than being in a tent or simply being outdoors during a storm.
Again...just my opinion.
I still love the idea of having Mythbusters test this out for us though.