More from Light Blue Touchpaper, a continuation of my last post about IP traceability on mobile networks has now been released, parts 2 and 3 are availiable at the below links:
http://www.lightbluetouchpaper.org/2010/01/13/practical-mobile-internet-access-traceability/
http://www.lightbluetouchpaper.org/2010/01/14/mobile-internet-access-data-retention-not/