Whitesnake starkers in Tokyo. Nirvana is a good call as well. ANd love lemmys Ace of SPades acoustic. Clapton layla is worth a mention.
"The nightmares invading the sleep of Bayern fans involve four horsemen of the Champions League Apocalypse riding towards them. As the faces come into focus, they will recognise Frank Lampard, Cole, Petr Cech and Drogba. All were immense..."
My youtube video favourites list is full pretty much by acoustic versions of big tunes to be honest but alot of the Mumford & Sons acoustic performances are quality!
Also the Incubus Unplugged session was awesome......definately worth a look up anyway!