Sidebar/post issues in IE7, but not in FF

I have searched for this already in the forums. My site yavillage.com looks and works fine in FF. But w/ IE7 the 3rd post title appears where the sidebar should be, and the sidebar appears under the posts. And after the forth post, the theme looks like its deactivated. I’ve deleted the post, but it happens again, and everything shifts up. Thats just on the main/blog page. On the other pages, the sidebar just appears under the page content.

Please help.