The Kindle Development Kit (KDK) will be available in limited beta form next month and the new software and other content from the initiative is expected to be in the Kindle Store later this year, Amazon said in a statement.

Examples of what kind of content people can expect for their Kindles include travel books with real-time weather updates and current events, cookbooks that recommend menus for people with allergies or different kinds of parties, and the inclusion of word games and puzzles for the Kindle.

The KDK gives software developers access to programming interfaces, sample code, tools and documentation to build content for Kindle's high-resolution electronic paper and to use its 3G capability and other functions.

TUAW has learned that Apple has begun rejecting all e-book submissions because "this category of applications is often used for the purpose of infringing upon third party rights. We have chosen to not publish this type of application to the App Store." At first glance, this policy seems in line with Apple's approach to applications that promise charitable contributions. Apple cannot police the developers and will not allow possibly fraudulent postings on their store. Apple does not want to be in the position of vetting rights claims.

At the same time, Apple has been rejecting applications from content providers who do in fact own the rights to their materials and can prove those rights. A colleague who spoke on the condition of anonymity related that a project he developed for a national content syndicate was rejected without recourse. He still got paid for his work but the application languishes without an outlet.

Apple isn't stopping with content source providers. They're also targeting those who provide media browsing tools. Another developer who built an e-book reader received a recent rejection along the same lines. The application might be used to read copyright infringing books, so Apple will not let it in App Store. In an e-mail, he wrote, "Leaving aside the presumption of innocence, [what] about iTunes and iPod; shouldn't they be banned too? After all many users indeed are using them to listen to the music that is not always legally obtained."