The google maps streetview player will take in either a starting point and end point, or a provided file of a route and provide a playthrough of the google streetview images that are available.
Google has started charging for their API usage. To use this site in the future you may have to provide a Google API key. This site was always mostly a proof of concept of something that could be done with the Google APIs. Click here to read about the new charges being imposed by Google.