I think I've got the blog looking the way I want it to. I need to futz around with the sidebar elements somewhat. But unfortunately, it doesn't look right in Internet Explorer. I don't know what the problem is yet.

EDIT: Fixed it! I had to add an extra float property. For some reason IE7 assigned a float:right to the main content, so it moved when the window was resized. Now it doesn't because I added a float:left, so everything sticks to the left side of the window.