Amazon will release a beta version of the Kindle Development Kit next month.
Here's an excerpt from the press release:
For the past two years, Amazon has welcomed authors and publishers to directly upload and sell content in the Kindle Store through the self-service Kindle publishing platform. Today, Amazon announced that it is inviting software developers to build and upload active content that will be available in the Kindle Store later this year. The new Kindle Development Kit gives developers access to programming interfaces, tools and documentation to build active content for Kindle—the #1 bestselling, most wished for, and most gifted product across all categories on Amazon. Developers can learn more about the Kindle Development Kit today at http://www.amazon.com/kdk/ and sign up to be notified when the limited beta starts next month.
"We've heard from lots of developers over the past two years who are excited to build on top of Kindle," said Ian Freed, Vice President, Amazon Kindle. "The Kindle Development Kit opens many possibilities–we look forward to being surprised by what developers invent."
The Kindle Development Kit enables developers to build active content that leverages Kindle's unique combination of seamless and invisible 3G wireless delivery over Amazon Whispernet, high-resolution electronic paper display that looks and reads like real paper, and long battery life of seven days with wireless activated. For example, Handmark is building an active Zagat guide featuring their trusted ratings, reviews and more for restaurants in cities around the world, and Sonic Boom is building word games and puzzles.