Not only can the iPad help find your lost iPhone, but it, itself, can be found using MobileMe.  Nice that it will find your WiFi-only iPad  as well, so long as it is connected to a network (though the accuracy may leave you looking for awhile :P).  You can also remotely wipe it just like an iPhone if it falls into the wrong hands.  iPad and Mobile 

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Seth Weintraub's favorite gear