So...a tie in the electoral college is of course unlikely...but there are a few scenarios that would mean that there could be a 269-269 electoral tie.
The "overtime" rules for this situation is so unique, that in our current situation, it could result in a Barack Obama - Sarah Palin Ticket.Here's how it works.
If there's a tie, the house gets to vote on who get's to be the president. Each state gets one vote, so the three Wyoming delegates vote and the 54 California delegates vote, and Wyoming gets one vote, and California gets one vote.
With the current situation in the house the president would be Obama, assuming everyone votes along party lines.
But, the vice president is decided by the Senate who will also vote, each vote counting as 1. With a 51-49 democratic majority you'd expect a democratic win, but Joseph Lieberman has clearly lauded the McCain-Palin ticket, and if he were to vote for Sarah there'd be another tie. 50-50.
In this case, the current vice president is given the opportunity to make the deciding vote...which we can only assume Dick Cheney would chose Sarah Palin.
Giving us an mix matched ticket of Obama and Palin that only fiction (and the photoshop expertise above) could write.
(An example of a scenario with a 269-269 tie would be Obama wins Kerry's 2004 states plus Iowa, Colorado, and New Mexico, but loses New Hampshire. Another scenario is Obama wins Kerry states plus Iowa, Nevada and New Mexico, and McCain gains to ground.)