Im answering two questions for you guys and i have one...
Yes, there is an "x" to close the browser and there is a star for bookmarking.
Video says its an Mp4, but how do you know if its a 720p?
If there is no way to find out within the phone, try recording at the highest setting than transfer the phone to a computer and check the file's properties for resolution, or even load it into the a video editing software to double check the resolution.
Now I'll repost my post form above for the poster above:
If anyone doubts him, you should doubt him much less. Check the first page, someone asked him to take a picture of a a pop can, Nexus one and a tv remote. He did so at 6:13, go back to the first page. Worst case scenario, he had temporary access to the phone, all he said would still be valid.
If I put my tin foil hat on, there is still a minor possibility that he has a 2nd membership here and he prepared a photo shopped picture in advance and then conveniently used his second account to ask himself to post proof by requesting the items to be in the picture which he had faked in advance. If you are buying into this theory, you don't need Nexus one info, you need to stop reading my post right now and take your medication.
Not directly answering the 720p and app questions invites doubt. But the man has a life and a wife. I think he is concerned about privacy of his source hence he is not posting the info he was asked for.
Unless his real name is Rick Astley, I say he still has forum creds.
Back to topic, here is a thread from AC, this guy says it does 720p:
So I held a Nexus One today... - Android Community Forums