I thought this was an interesting online device.
The predictions are made by the NPR political editor, I presumed based on the latest polling in individual states. You can change the predictions or assign votes to the "toss up" states and see how it effects the electoral math. You can also see how things went down in the last three presidential elections.

Currently, the maps predicts 232 votes for McCain and 200 for Obama, with major players like MI, OH, and PA up for grabs.

EDITED:
I've just discovered that, if you work at it, you can create a tie where both candidates get only 269 electoral votes, thus giving the decision to congress. Wouldn't THAT be exciting!

__________________
To educate a man in mind and not in morals is to educate a menace to society. -Theodore Roosevelt