The Amazon Kindle is one of the most popular eReaders on the market and sold like crazy over the holiday season. Right now, the only type of content available on the device are books and magazines. Amazon is looking to add active content through.

Amazon has unveiled a new Kindle Development Kit (KDK) that will launch in limited beta next month. A limited number of developers will be allowed into the beta program to start with. They will be allowed to download the KDK to work on active apps for the reader.

The KDK includes code snippets, documents, and a simulator that can simulate both the Kindle and Kindle DX on Mac or PC platforms. Active content is expected later this year and will include games and other content types.