okay just looked, got the same error.
the space above the header for me is about twice page size
and also the space after the footer, page is estimated 2x height than needed.
In firefox it looks fine, also in chrome.

Using Internet Explore 8 rc1
Firefox 3.x and chrome donno.

Problem in the new internet explore is the same as here on Vbulletin.org :p
its not compatable, after the image resizer "resizes" the image the browser
"should" cut the page down in size, but instead it keeps the original load size
not narrowing it in. dont know if its the same for IE7 cause i cant uninstall
this awfull browser.

So im sure its a IE issue, and for some reason the compability botton does
not appear like it does for sites like vbulletin.org which is not ie8 compatible.
see img. Attachment 94803 this i get here,
and usually websites look "normal" if i click it, but it dosent show on your site.

try another browser.. ?

Oh Yes Vaupell... you are right... I try with firefox and looks rigth like Dismounted...

Is an Explorer problem.... so... Do you think this will be resolve in time????....

<td> is used instead of <tr> tag in your header. (3rd line below <!-- logo --> )

</div> missing in your footer. (add closing div at the bottom of footer just above javascript)

.

I am glad I could help. :)

Bad News... Seemingly works with IE... but in Mozilla looks very bad... Now I have to undone the change :(