Two sites that do a good job showing statistics about the campaign:

• Electoral Vote Predictor collates data from polls across the country to predict the outcome of the electoral vote. The maps are clear and informative, showing which states are near-balance, and which are clearly on one side or the other.
• Fundrace.org collects campaign contribution data into a searchable database so you can find out who is giving what to whom. Search by address or name. Very cool.