The Google Phone HTC G1 was the first to have street view in Google Maps..
Apple iPhone was soon to follow with the 2.2 firmware bringing StreetView
Finally its available for Nokia S60 phones and Windows Mobile Phones
This update brings a total revamp of the User interface .. I tested it on E71 and loved it ..
Other changes include addition of Walking directions and enhancements to the public transit ..
you can also read reviews of locations on the phone
visit google.com/gmm from your mobile phone to get this latest update
The only bad news is that Street view is not available in India
But My location ,GPS and Maps work well
Google has put a video demo of the App in action
[youtube]http://in.youtube.com/watch?v=3IXC5A1ZoV4[/youtube]