After months of planning and testing, the Internet’s No. 1 video-sharing site, YouTube, launched a new look and received mixed reviews. The redesign eliminates one of the chief irritants to tubesters: clutter. “We heard from users that there are a lot of unnecessary features and clutter that could be cleaned up,” said YouTube spokesperson Chris Dale. “Video is the center of our universe, and it’s the center of the user’s universe, and that is much clearer in this redesign than it has been in the past.”