This was just announced on their blog
Smashwords today announced a distribution agreement to supply ebooks to the Amazon Kindle Store.
The news follows other important Smashwords distribution agreements we announced in the last three months with Barnes & Noble, Sony and Shortcovers.
I'm so pleased to call each of these retailers a valued Smashwords partner, and I look forward to working with them to showcase our fast-growing catalog of nearly 5,000 independently published ebooks.
Our Amazon agreement marks an important milestone in the evolution of Smashwords. We launched in May 2008 as an ebook publishing platform for indie authors. In May of this year, we expanded the platform to support small publishers. In the last couple months, we've transitioned to a full-fledged distributor of ebooks capable of serving authors and publishers around the world. We're just getting started.