Here are two articles over at Gizmowatch that breaks down the hype about the new Kindles and puts out all that you need to know in simple terms.
If your question is "which Kindle should I buy?," read this article.
If you want the lowdown on the Kindle Touch 3G and the free unlimited wireless, read this article.
If you have figured out which one you want to buy, click on the links below to directly go to the product page on Amazon for more details.
Kindle Keyboard, WiFi
Kindle Keyboard, 3G
Kindle Fire, WiFi
Kindle Touch, 3G