I actually admire Alonso's skill as a driver but irrespective of fandom, what he did today was stupid and dangerous. He could have injured himself and others.
It seems we are careering down the path of creating namby-pamby's out of F1 drivers. To try and mount an argument that expecting an F1 driver to be able to see and maneuver his car with a dozen car lengths of visibility while traveling at 70Kph somehow represents "danger" is just silly. I believe it was Lewis driving, he barly moved his hands, and most importantly, watch his helmet as he goes past, it doesn't even warrant a second glance - if a 70kph move with a football field on either side is dangerous then the emasculation of F1 is complete. I'm going to sit down now and watch Giles battling with Rene in 79 and think about how dangerous Alonso and Webber are

Oh, and the booing of Vettel was worse than the stewarding today, I can understand at Monza - anyone who beats a Ferrari is booed, but in a neutral country I was quite angry at the booing, its not right. Well done to Martin Brundle for telling them to stop though!
I think all the booing relates to multi-21 at Malaysia - people have a right to their own views on that and I don't think their right to protest should be taken away from them.