KDroid
Cyborg Agent
If you are following the chatter on social networking sites such as Google+, Facebook or Twitter, you may have noticed that YouTube is currently testing a new homepage design. Clever folks found out a way to enable the new design right now with a cookie. The advantage of this method is that you can clear the cookie to return to the old YouTube interface, no harm done.
1. Go to YouTube - Broadcast Yourself.
2. Press Ctrl + Shift and J in Chrome to open the Developer Tools.
Press Ctrl+Shift+K in Firefox
3. Click on the "Console" Tab and enter
document.cookie="VISITOR_INFO1_LIVE=ST1Ti53r4fU";
*img254.imageshack.us/img254/9874/67884f54e30d4a9394e30f5.png
*k.minus.com/jxWgDrUZdzNH5.png
4. Reload the website and enjoy the new layout.
*www.ghacks.net/wp-content/uploads/2011/11/youtube-new-homepage-600x435.jpg
I could not make it work on Opera.