MSNBC has a mash-up based on Microsoft's virtual Earth. Push-pins provide detailed information. (Hat tip: Very Spatial).
The New York Times has a series of maps for the House, Senate, and Governorships. By clicking on the states one can get detailed information not only on the race but also of the state. It even gives how conservative or liberal the incumbent has been in the past.
FOX News will be updating their map as elections come in. Besides election results not much can be found.