http://www.oredon.com/content/en/produits.php?id=26

I think this is the closest thing on the market that I've heard of. Not sure how well executed these Oredon products are, but it's a cool idea. I like their locking skewers too. I've got the Onguard/Pinhead version, but the Onguard ones don't have the freely rotating collar around the security nut, like PitLocks have.