Brick, thanks for your contributions -- and for resurrecting this topic!

Ok, here's another one, a fun one: The Dialectizer. It's pretty good. You type in some text, or give it an URL, and it'll reproduce it in any of half a dozen dialects (more to come, they say).
http://rinkworks.com/dialect/

Here's my first sentence, rendered in Redneck:

“Thanks fo' yer corntribushuns -- an' fo' resurreckin' this hyar topic! Fry mah hide!”

(I kinda got a giggle out of that gratuitious “Fry mah hide”)