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Although not confirmed, most people suspect that it is by a graffiti artist named Banksy. He has a website here: http://www.banksy.co.uk/
Another amazing piece of graffiti is this one:

And this one is an idea that I had a while back, and it's nice to see someone as actually gone out and done it!

And you can view some others here: http://pressesc.com/01171714555_top_5_graffiti