I've supported Button since 2000. I liked Honda, and I think Brawn are brilliant (because of what they've done in a short amount of time - forming the team from the remains of Honda F1, adapting the car to a different engine, barely testing and yet winning the first race. I suppose that could be considered as supporting them because they are quick, but I like to think I support them because they used to be slow).
But I think Vettel will end up pinching the championship. Or Kubica. The Ferrari's haven't gelled yet and it'll be too late by the time they do. McLaren is rubbish, and I don't think they'll luck into 3rds very often, or even points every race. Even Minardi scored points at Melbourne with Webber, but look where they were nearly everywhere else.
One wonders what Toyota will manage without the terrible luck they had in Oz. I think they'll be nearly there all year, but not quite break into the regular winners circle. But Glock will win one.