My screen resolution is 1280 x 800, and I get the same problem. I'm using Firefox.
Feedback:
* Put the User Of The Week bit above the Top 5 Stats bit.
* Make all the post icons the same size. The space doesn't have to be filled, just the width of the post icons all the same size, so the text is all aligned (forum home page).
* Make the blue forum header a slight gradient, to make it look better.
* Make the thread/post numbers in the forum home into a lighter font, so they're easier to see.
* Seperate the Donate and About table by a small gap (20px or so).
I like the look of it so far, just needs a little tweaking here and there