Ask HN: Anyone developing for the Kindle?

Dear Developer,

Thank you for your interest in the Kindle Development Kit (KDK). We’ve received far more interest from the developer community than we anticipated. We are still in limited beta and are working closely with the developers who have been given early access to the KDK.

We appreciate your patience while we work towards opening up the program to more developers.

Regards, The KDK Team

So is anyone developing for it? I've been waiting for an entry but to no avail... Or is it even worth some time in it?