I am a big fan of Google Earth as I have said before on this thread, and I see that they have added Street Views to it which is welcome, however for me having played with it this morning, it only adds .25 of a star to the application. The actual image is not very sharp, but thats totally excusable given that the street view image is relatively low resolution, and when converted to a 3D view this can't be helped. However the way the street view has been added for me is very cobbled.
The position where you place yourself is very imprecise compared to the browser version, also once in street view you are not able to move as you can in the browser version except for rotating. The actual street view image is in full 3D and not 2D images wrapped around you which is better than I expected. But like I said, the way it has been implemented for me is a big let down.