jogol, thanks for the tip. It almost solves my problem, but not quite...
Because #page is not flush with the top of the window, having it @ 100% is producing an object that's taller than the page window height (because of the offset)
#page is not getting larger when I open the comments (there's a slide down with those).
I let the page with the new CSS code so you can see what I'm talking about.
I guess the solution is not that simple after all... Any other suggestions?
P.S.: I fixed the empty page problem.