Well I'm an adopted Londoner and Ken got my vote, with the liberal guy for my second choice (basically just not to give it to Borris).
I really think Ken needs another four years to follow through with the projects he has started - he should be given the time to fully deliver the Olympics, the cross rail thing, the on-going public transportation works.
He doing a big and tough job quite well I think, I've definitely seen the improvements in this city in the seven or so years i've been here.
Plus if Boris gets in and publishes this New York style crime map, my area might become quite undesirable and the value of my flat might plummet.