Just noticed this right now: you can view the full version on YouTube on the iPad; before you couldn't - not even if you enabled HTML5 beta. You get to it by clicking on 'desktop' on the bottom of the mobile version of YouTube, via Safari. Annotations now work - this is showing the advancements made in HTML5. It's exactly like the desktop experience - apart from you cannot view (at the current time) people's user pages, as it's based on flash; but clicking on 'view comments, video responces etc.' will take you to the HTML5 version. Also, videos that are specifically marked as not for mobile still cannot be played by the iPad. I will, for one, be using this more than the mobile version, as I can see highest rated comments and, well, I just prefer it to the mobile version, and definitely to the default Apple one.