Well, I came across another article trying to figure out how many Kindles Amazon has sold or will sell in the near future.  Some of methods used by the author for determining success -- since Amazon has been so tight lipped about the subject -- is listed below.

  1. Kindle ranked #1 in electronics
  2. The number of Amazon reviews for the Kindle top 2,500
  3. Quality of reviews for the Kindle
  4. The fact that Steve Gibson's review had been reviewed by over 27,000 people.

So, base on this criteria, they think Amazon has sold between 10,000 to 30,000 Kindles.