A resident of the Second Life virtual world who owns a UK branding company has started to move the characters he represents into the game, starting with those managed by Disney, one of his clients. The first into the virtual world is Marvin, the Paranoid Android, from the Hitchhikers' Guide to the Galaxy movie.
During the movie's production, Fizik Baskerville and his team created the Marvin avatar based on the production designer's specs, using that to plan a marketing campaign for their client, Disney. "We did that not only for Hitchhiker's… we did it for Pirates of the Carribean 2/3 and Chronicles of Narnia." Using SL's avatar customization tools, "Within a short period of time we have [characters from these Disney films] walking around those ideas as avatars."
(Thanks, James!)