Ars has a lovely story of how a man was able to install an app called Plan B wirelessly to his missing Droid using the Android Market’s remote install capabilities, activate it and (eventually) find his phone.  He was able to install the application over the air from the Web Android market.  It activated and alerted him to its location, rather than having to have been enabled on the phone before it was stolen.

Just another case of where remote application installation saves the day.

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