I think the most current and relevant statistic published to date remians the Wired interview in October where Bezos claims 48% of sales of books where Kindle and paper versions exist are Kindle sales.
http://www.wired.com/gadgetlab/2009/...tional-kindle/
Annoying as the original article is for all the reasons above, I bet Amazon have shipped boat loads of Kindles in the past couple of months. Still haven't seen one in the UK, and Sonys are getting less rare on the commuter trains these days
amjb