eSeats.com are using Google Maps with custom tiles of a map of the United Center in Chicago to help customers find the best seats when booking.
Importing the map of the stadium into Google Maps allows the user to pan and zoom the map. However eSeats.com have also made all the seat blocks clickable. So if you click on a numbered seat block on the map you can preview a photograph of the court from that block. In this way you can preview your view before booking a seat.