A couple of months ago I conjectured that Google might be able to produce a very accurate exit poll for the '08 Election. Today's post on the Official Google Blog shows some information that's very close to what I suspected they could generate - very cool. Particularly interesting is analysis of traffic from swing states. I'm sure they could do much more here - trending by counties, for instance.
In that previous post of mine, I guessed that they won't publicly release a prediction, but bits and pieces of information and trends like these are a good stand-in for a full blown exit poll.