It would seem that since the h1 set to a fixed width, and the .leaderboard div set to a fixed width (both adding up to be over 800px), they do not contract like the rest.

That may be the problem.

EDIT: Heh, but also looking at it, having the featured image as one big image won't allow the rest to expand either. (http://cmstemplates.net/sales/blog6/..._container.gif). Thats over 1000px itself. So nothing below 1000px will work.