MyMapPlus on iPhone ver1.4 released!  (2011 Nov 16)

App name: Google MyMap+
http://itunes.apple.com/en/app/mymap/id467908886?mt=8

More info
http://iphone-en.mymapplus.com

Data can be exchanged between iphone and browser any time.
 Jogdial/Map zoom
 Search directions
 Streetviews
 You can do many things with one hand.

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MyMapPlus on Android.