I am re-posting this thread and the links within because with all the GOTV talk we are engaging in, this is the most important place to start.
I personally just went through a name change, and wonder if my voter reg was updated automatically by the DMV... if not, while I still have my old DL, I could get sent away because it is not a valid ID (it was hole punched when they gave me a new one)
SO help YOURSELF and EVERYONE else you can!
http://www.democraticunderground.com/10021136223
thanks to Jane Q public for the original thread