Yesterday at school I heard from a classmate that there is a new Youtube interface called Cosmic Panda which you are able to try out.
To activate it, you have to visit the following page:
As I’m writing this, I have only watched a single video with this interface. But it looked pretty slick on that video. 
The profile pages have also been updated.
Check it out if you are interested. You can always deactivate it by visiting the page and pressing a button.
I also saw that they have a page dedicated to testing stuff:
Ummm… Lets see if I can explain what Jupiter Broadcasting is. The sub-title on their website is “independent entertainment, on demand”, and I think that pretty much sums it up. What I have seen, there are three persons making the videos, or at least I have only seen three in the videos. Maybe there are more behind the scenes, I don’t know. However, they have five shows (according to their homepage), where I find their show Linux Action Show the best. It’s broadcasted live every Sunday on their website, and then uploaded online for downloading and streaming. It’s usually about one hour long, and it’s fun and informative. But they don’t have that many viewers, according to the numbers below the videos on their Youtube Channel. Maybe many watch them live, or watch the episodes on their official website instead, or maybe download the episodes, I don’t know. But I really want more people to check these guys out, because they are doing a great work on their spare time – which they are providing to us completely free of charge.
I have added some links below. I hope you will like their work as much as I do.
Yesterday I wanted to watch an age restricted video on YouTube, but I got the following well-known message: