Engadget was at the event in New York where Jeff Bezos of Amazon made this announcement. You can find the play-by-play and product descriptions at the link.
Fire (color tablet) for $199, Touch 3G for $149, Touch for $99, and Kindle for $79. Kindles compared here.
Here is an open letter and product description at Amazon.
This is going to shake the eBook Revolution to its core. (Notice the $79 price we’ve been predicting all year? Just saying…)