The person whose LJ I stole it from is British, so I can't say if they got an 'accurate' accent. But it actually pinpointed my accent down pretty well (Western), and even gives a list of other options about where you might be from if you're not from the West.
So, other Americans - if you take this quiz, how accurate is it in telling you your accent?
And, not-Yanks - if you take this quiz, what do you get? In listening to that American accent, would you say it's somewhat close to your own?
Mostly just for kicks and giggles, but I thought this might be interesting to see the effect of. :)