You can see a trailer for this movie here:
http://trailers.apple.com/trailers/lions_gate/kickass/

This film should be on general release today, or tomorrow.

So has anyone seen it? I went to a special preview over the weekend, and enjoyed it.

The film is a spin the super hero formula, where we see ordinary people dress up in costumes and fight crime, without any powers. The film has been a little controversial, due some of the younger characters swearing and engaging in a great deal of violence, but that personally didn't bother me, as it seemed to more of a pi$$ take on action movies in that regard.

Unfortunately Quick Time is needed to watch the movie on the website you've written about. But I typed in the title on youtube and found some trailers as well.

I haven't heard about this movie yet, but it might be quite interesting. It's kind of comedy film I guess.
Anyway, I won't go to the cinema to watch this movie. I prefer horrors or action (but real action) movies.

Well, its more of an action comedy. There are several very well done action sequences, which I was very impressed by. Personally, i think the director did a good job balancing the comedy and action elements.