The New York Times provides an interactive map that lets you see which states are, according to the Times, leaning one way or another. If you click the Electoral Votes button, you get a nifty little animation, morphing from the geographical map to an area-proportional-to-votes diagram. You can also look at other maps, providing information about Senate and House races and previous elections and so on. And if you click the "Presidential Calculator" link, you can interactively choose which states go to Bush and which go to Kerry, and it'll calculate electoral votes for you.
It was last updated yesterday, October 9, after the second presidential debate, though I have no idea whether its poll numbers reflect any changes of opinion wrought by that debate. And last week's Unfutz electoral college survey (which may not have included many polls from after the first debate) showed significantly stronger support for Bush than this map does. But the map is still pretty nifty, regardless of how accurate its numbers are for electoral-vote predictions.
Requires Flash, I think.