I totally disagree with this law.
Now I'm as secular as the next non-religious guy, but if a religious fundy-nut like Pat Robertson started complaining about this law being anti- religious bigotry, I'd have to agree with him. A religious head scarf/ turbun, etc. does not force anyone to observe the other persons religion or anything like that, it's no different than if some secular person preferred to wear red everyday for good luck. This is a big time encroachment on freedom of religion and speech; the kids aren't trying to convert anyone nor endanger anyone with these religious symbols, they are simply trying to express their own religious faith (or their parent's, depending on the situation).
Now I totally understand that France has been having some cultural clashes with its Muslim population (hell, which country doesn't? Let's just wait untill the US' Muslim population gets significant), but as some other posters have pointed out, this ban will not mitigate the situation in anyway. Hell, it will most likely make it worse. Find useful ways to deal with the situation instead of divisive ones like this. Poor Sheiks, Jews, etc. having to needlessly suffer.
Let freedom (of religion) ring.