Nathan Eagle's presentation at the Where 2.0 conference has some very interesting information about how easy it is to deduce interesting facts by monitoring cell phone location and proximity. Todd Biske has taken that and turned it into a call for better logging in SOA applications for the purpose of improving usability. This point to the need to carefully construct security policies around XML documents that are passed from place to place so that this kind of monitoring can occur without compromising sensitive data.

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