Need Help On Skin/Stylesheet Change

I recently noticed that the webpage for my blog Resource.full has changed to shift the sidebar column way to the right. I did not do this in any skin editor or stylesheet - it just happened. I posted the details today in the blog with two screenshots of the problem. If anyone can advise me I would be very thankful.

Here is the link to the blog entry on the problem: resourcefull.antville.org