I have 3 divs that correspond to this.
I have #wrapper which wraps around everything. That is #EEE
I have #contain which is inside #wrapper right after. That is #FFF (part with the content)
I have #secondaryContent which is height:100% perfectly fine, position:fixed. which is inside both of those divs.
I added borders to all the main divs to see what's up.
Okay so, the bottom of the middle div is supposed to extend to the bottom at 100% showing no grey from the wrapper. If you look closely at the top of the page You can see a purple line. That's actually a div called #content, which is supposed to have all of the posts in it. I don't know what it's showing as if there's nothing in it but it should //(* fixed * - see second answer).
You can see what I mean via my server.
FIX***
the class '.container' that is applied to the #wrapper div is what screwed everything up.