To clarify I am talking about the download of the new 2.1 Dock Software - no need to Root. I downloaded it and the new look when you put the Droid in the Dock is WAY better.
My point was that in the NEW software (not new Dock) after 5 minutes it changes to a green small clock that shifts position every 5 minutes. If you don't like it you tap the screen and it keep the better one on after that all night.
My theory was as has been discussed Screen Burn In. I do have 4 LCD monitors at home, 1 of which has the same things on it every day and has for year and I did get some "Screen Persistence" However as that article says if you turn it off it will go away (which I found out after my power adapter burned out and didn't use it for a month).
All in all I guess it doesnt matter since you are sleeping anyway whether it's the green one or the fancy cool looking one. Keep reading the thread if you want to download it someone posted a link. It's way better than the original.