So the problem might be one of your widgets or your posts. For the widgets, try going to Appearance > Widgets and dragging/dropping one widget at a time from the sidebar to the inactive widgets area, until the problem stops (then you’ll know which widget poses a problem).
As airodyssey suspected, the problem is an extra div tag in the widget you added yesterday. The HTML after the image code is: <DIV><A HREF="http://oliverandruby.wordpress.com/">The Oliver and Ruby Chronicles</A><div></div>
Should be: <div><a href="http://oliverandruby.wordpress.com/">The Oliver and Ruby Chronicles</a></div>
Or with no div tags at all.