ROCK THE VOTE Electoral-Vote.Com, one of the political-junkie polling sites I linke a few days ago, has excellent advice for everyone planning to vote in this election:

Several lawyers have contacted me about the issue of what to do if you show up to vote and the election officials say you are not registered. Here is the procedure. First, be absolutely sure you are in the correct precinct. If you are in the wrong precinct, in most states, your vote won’t be counted. If you are not 100% certain of your polling place, go to www.mypollingplace.com and check. Alternatively, call the toll-free number 1-866-OUR-VOTE or your county clerk. If you are sure you are in the correct polling place and the officials claim you are not registered, ask for a provisional ballot and fill it out correctly. You are entitled to one by law. Politely, but firmly, insist on being given a provisional ballot.