Kitchen Nightmares really need to have a 'year later' episode.
Even better, there should be a similar show with Click and Clank going to mechanic shops.
Personally, I'd like to see one with software developers. Where I walk in and rip the hell out of their crappy code. This is awesome because you can find fault anywhere; even in more places then a kitchen.
I could goo on with that last one. Hell I can even think how to sell it. Can anyone get me an executive to pitch it to?