requires you to register, but once you do, click on the interactive electoral map. Don't worry about the colors already filled in, these are just polling averages.
What it lets you do is change which state each candidate gets - make predictions on a state by state basis and strategize your way to victory.
If you prefer to let others do the work, try http://www.electoral-vote.com/. This is run by a kerry supporter, but he has bent over backwards to be fair. Up till today, it showed bush with 280 electoral votes.
Anyway, play there, and lets try to keep this site civil.