Google’s StreetView images are now avialable for these additional cities: Boston, Providence, Dallas, Fort Worth, Indianapolis, Detroit, Minneapolis and St. Paul. That brings the total number of cities covered by Google StreetView to 23. Soon cities in Australia, Canada and Europe will be added to the list.
i count 21
Google claim it’s 23 here:
http://google-latlong.blogspot.com/2007/12/enjoy-holidays-with-new-street-view.html