UPDATE 24 Mar 2010: This turns out to be the work of Andrew Zubko, who is surprisingly surprised at how popular his illustration became. He would be happy to sell posters, tshirts, etc, but doesn’t have the trademark rights and may not be able to do so. If you’re interested in a copy, he asks that you email him at firstname.lastname@example.org and he’ll let you know if & when he has more information.
Naturally, Mr. Zubko is also on Twitter, as @AndrewZubko. Amazingly, he only has 23 followers as of this writing. If you’re on the Twitters, please to be helping to fix this now, mmmkay?