I was thinking one of the great things that you could possibly do with the new format (and mind you I have virtually no understanding of whether that would even work) is to put those sorts of "register now" ads on the sides of the page and possibly have it so that it scrolls with the page. That way its not in the way but its still clearly visible.
I just incorporated this so that the button in its usual static place in the photo I posted above. However, when you scroll past it (as a guest), it reappears to the very right of the page. This means it will be way off in empty space if you have a high screen resolution, or right over the search bar if you have a low one.
Not really sure about the placement, but the effect is what I think you were talking about.