Took out presupporting membership in the London Worldcon bid for 2014
http://www.londonin2014.org
It looks like a credible bid and the site is the London Excel centre, which is huge and is currently adding a lot more convention / conference facilities and accommodation for the Olympics. There currently don't seem to be any other bids for 2014, and I was rather too young for the last one in London which I think was 1965, so it definitely gets my vote.