Originally Posted by Oakleyguy
I have seen some special impact sockets that may be able to remove the lugs. But this will only work if there's enough room between the wheel and the lug itself. Basically the socket will "bite" into the outer casing of the lug and unscrew it in that manner (The inside looks like a beveled spiral with teeth). The lug will become unusable afterwards though. If I remember correctly these are only available to licensed mechanic shops, so your mechanic should be able to locate one. Good luck!
Sears sells these impact sockets. A little frighteningly easy to buy.