Storing your data is only scratching the surface of what these guys are up to.<p>See, for example: <a href="http://sensenetworks.com/macrosense.php" rel="nofollow">http://sensenetworks.com/macrosense.php</a><p>Disclaimer: I previously worked for a large carrier.
This is a nice enumeration of the details, but should we really be surprised at all that they're doing it? Compliance with CALEA requires that some of this information be retained in addition to the ability to tap communications.