Problem with float: sidebar dropped below main content div

Got a problem with a blog that for the most part, is validating. Problem is the sidebar div, while to the right of the content div is dropped beneath the main content div instead of being to the right. OK, I’ve certainly had this issue before so I’ve been trying all sorts of ways to make it work including playing around with margins and padding, floats, display: inline’s and so on. Nothing is working and I’ve been trying to solve this all weekend. It’s really odd. Just now, I once again went into the HTML just to make sure the div’s are nested correctly and they were. So this shouldn’t be happening and of course, it is.

So here’s the page in question. Fortunately, I didn’t make it public yet but by Monday, it has to be:

http://www.bigeasytexas.com/kermit-ruffins-bio/

So any help would be greatly appreciated. Thanks.