YouTube is a great source for video of just about everything; mobile YouTube is pretty good in its current Android phone version. The new YouTube app in Android OS 3.0 (Honeycomb), however, is a clear step beyond that. It actually is an improvement over the desktop experience. There seems to be a trend forming within the Google apps as the Gmail app is also an improvement over its desktop counterpart.
The new UI launches into a 3D carousel that shows popular videos that can easily be scrolled through with seamless loading. All of the features are present, from commenting to related content, it's a complete experience. The home screen widget is just as impressive, allowing you to scroll through popular videos or through your subscribed content. Check out the video of a hands-on walkthrough.