Check out this trend chart:
http://www.google.com/trends?q=amazo...ate=ytd&sort=0
But wait, there is more. If you rank the region list by Kindle, you see that most searches are coming from the US and from Canada. Most searches for the Reader, on the other hand, are originating from Russia. My guess is that the Kindle is a lot less interesting to those who cannot use its Whispernet service.