To confirm which Kindle you have, look at the serial number on the back at the bottom (for Kindle 1, it's under the back cover). You should also be able to find it on the Kindle packaging.

Since firmware 2.5, it is also shown in the Settings page on your Kindle. This is also the only place you'll be able to check your S/N on a Kindle 3.

B001 = Kindle 1

B002 = Kindle 2 U.S. (Sprint)

B003 = Kindle 2 International (AT&T)

B004 = Kindle DX U.S.

B005 = Kindle DX International

B006 = Kindle 3 3G + WiFi Graphite/White (U.S. and Canada) NOTE: Some European cities may receive this serial number as well.

B008 = Kindle 3 WiFi

B009 = Kindle DX Graphite

B00A = Kindle 3 3G + WiFi Graphite (Europe)

B00E = Kindle 4 NoTouch (Europe?)

new: B00F = Kindle 3G Touch not clear if this is a kindle 3 or 4; Firmware version is 5.0.0 (store access via kindle only usable with amazon.com - not amazon.de)