There was a pretty cool show on PBS on Thursday night/Friday morning called Do You Speak American or something like that. It was a three part series, but they played all three parts back to back, which was cool. It isn't like I actually sleep anymore anyway.
They travelled all over the US looking at the accents and the way the English was used and was changing in the US. You could do the same thing practically anyplace. They touched on everything from slang to how people speak affects the way they are perceived.
I thought you might be interested so I thought I'd let you know. You can find a link to the show at www.pbs.org/ (external - login to view)