The irony is that kindlepid.py has been around ever since Kindle 1 got launched (end of 2007, early 2008?) It makes me wonder why Amazon has suddenly decided to invoke DMCA against this tool.
In all fairness, I don't think preventing us to use the PID code for .mobi e-book purchases elsewhere is Amazon's main objective. Or why wait until today? So... the Kindle iPhone app, which was recently released, comes into mind...
