StreetSmart Navigation:

Navigate using Google Maps Street View! Enter your start and end addresses and generate a route that gets divided into steps. For each step you will see a Street View image pointing in the route direction.

Basic version, for use in route planning and walking. Mobile version with "blue-dot" tracking, for use when walking the route. "Start" should be nearlby.
'Blue-dot" tracking, for use when walking the route. "Start" defaults to current position.
'Blue-dot" tracking, for use when walking the route. Adds arrow pointing in your direction.
Detects tunnels on a driving route. Detects tunnels on a driving route (beta)