Here are links to polls and predictions three days before the election.
Fivethirtyeight: Nate Silver's analytical poll of polls
Princeton Election Consortium: Sam Wang's meta-analysis of the polls
Real Clear Politics Latest Election Polls: Lists the polls released each day - surprise!
Talking Points Memo Electoral Scoreboard: PollTracker.com's best guesstimates.
The Rand Continuous 2012 Presidential Election Poll: A daily poll reflecting the views of 3,500 people who keep changing their minds!
Intrade.com: A betting site (sorry, "prediction site" - and those are "air quotes") - the top market is for "Barack Obama to be re-elected President in 2012").
Betfair: An English betting site where over $20 million has already been wagered on the election.
Have fun and be sure to vote!