Side bar showing below content.

Ok, need some serious help here. My site gets a decent amount of traffic so I’m looking to resolve this ASAP.

For some reason, out of nowhere, the side bar has been pushed below the body of the site. You can see an example at angryweb dot net. Scroll to the bottom and you will see the Facebook plugin as well as ads.

Nobody touched the actual files so I have no clue what would have spurred this.

Any help is greatly appreciated.