A fake Japanese programmer, Yutaka, is the main character of a viral campaign by Crispin Porter + Bogusky for Virgin Atlantic. London is showcased through a snazzily designed web site, YutakaLovesLondon [1] with tips on places to go. Click on the plane in the sky and you'll end up at Virgin's site.
An additional site supposedly created by Yutaka, YutakaProjects [2] gives you the power to change the time on Big Ben, raise and lower Tower Bridge and even put a message up at Piccadilly Circus. (hat tip Adverblog [3])
Links:
[1] http://yutakaloveslondon.com/
[2] http://www.yutakaprojects.com
[3] http://www.adverblog.com/archives/002653.htm
[4] http://technorati.com/tag/viral or youtube