Expedia: Hotel View
Expedia, the travel reservation website, has added Street Views to all their hotel views in the UK. The new Street View service allows visitors to explore the immediate vicinity of hotels before booking directly from Google Maps Street View.
The Street Views themselves are implemented really well. Expedia are using overlays on top of the views to display the hotel room prices and the room availability calendar. The Street Views also include an overlay with quick links to Street Views of other hotels nearby.