Theme appearance in IE

I have a suite of WP sites that run off the same template. Everything is cool in Chrome and FireFox but, in IE(6-9)… nothing is right. My analytics show a majority of the visitors are running some flavor of Internet Explorer. Is there a fix for the display problems other than revamping the entire template?

Here’s a few of the sites so you can pull them up and see the differences.
http://pannipizza.com/
http://jaysplaceoneonta.com/
http://legendsfillingstation.com/