Limit blogs creation

by

The signup page has validation hooks. How about something like this?

add_filter('wpmu_validate_blog_signup','set_blog_creation_limit');

function set_blog_creation_limit($result) {

    $blogs = get_blogs_of_user($result['user']->ID);

    if (count($blogs) > 2 )
        $result['errors']->add('blogname', __('You have already registered the maximum amount of blogs!'));

    return $result;
}