We have a partner named Cyclomedia that has a new offering. Check out the link. Their plan is to release this viewer in Esri's Marketplace. What makes them better than other Street Level Imagery offering? It is far more accurate, updated more frequently, and available inside the ArcGIS Platform.
Check out their demo application : http://coolmaps.esri.com/streetsmart3/
Learn more about Cyclomedia : Home (EN) | CycloMedia - EN
Very powerful. Should be of great interest for anyone willing to make measurements and data collection
