looks crowded. You have the sheilds borders laying edge to edge with the images/font. awkward. needs either some definate space or some obvious overlap. Too static as is. And the banner doesn't link to the home page.
center it. the "main page" link is right up on the left end but there is a gap on the right after "sponsors". Looks off.
sidebar: fine for me
content: too much padding on the left side. not even on the right. how the dotted line under "welcome students..." hits the image to right looks bad since the line doesn't fill the white space. the vertical under that doesn't line up and since everything else does it looks out of place.
but wait i have a a ff 1.0.4 problem for you. a riend had ff 1.0.4 and told me about this. I have ff 1.0.2 screeny attached: