The First Generation Kindle was released in November 2007, selling out in five and a half hours. The device remained out of stock for five months until late April 2008. Amazon did not sell the Kindle First Generation outside the United States. This information is sourced from Wikipedia/AmazonKindle

In October, 2009, Amazon announced an international version of the Kindle 2 with the ability to download new titles in over 100 countries. The international Kindle 2 was physically very similar to the U.S.-only model, although it uses a different mobile network standard. This information is sourced from Wikipedia/AmazonKindle

Amazon announced the Kindle DX in May, 2009. This device has a larger screen than the standard Kindle and supports simple PDF files. It was also the thinnest Kindle to date and offers an accelerometer, which enables the user to seamlessly rotate pages between landscape and portrait orientations when the Kindle DX is turned on its side. This information is sourced from Wikipedia/AmazonKindle

In July, 2010, Amazon released a new revision of the Kindle DX "Graphite". The new Kindle DX had an E Ink display with 50% better contrast ratio (due to new E Ink Pearl technology) and comes only in a "graphite" case color. This information is sourced from Wikipedia/AmazonKindle

The latest Kindle - The Kindle Fire released in September, 2011, has a color 7-inch multi-touch display with IPS technology and runs a forked version of Google's Android operating system. The device—which includes access to the Amazon Appstore, streaming movies and TV shows. This information is sourced from Wikipedia/KindleFire