This guy might have too much time on his hands, but I've got to give him credit for a clever idea, well executed.
Jeff Kay, who describes himself as "an Ugly American living on the cusp of a mid-life crisis," runs a blog called The West Virginia Surf Report (even though he lives in Scranton, PA). He recently took the time to compare the food seen in fast food advertisements to what the items look like in reality.
An unpalatable preview:
Check out the full report.