Given today's Coding4Fun post (cough and Friday's...) I wanted to add this special/out-of-band post, which includes Band and Band 2 support and the new Experience design guidelines for Microsoft Band 2

Create amazing app experiences for Microsoft Band.

Extend the experience of your application to your users' wrists via a new dimension of interaction. Create an app that can send UI content to the band, keeping users engaged when they're in motion. Your app can also receive data directly from the band sensors, giving your users more reasons to interact with it. Create a personalized, data-rich, custom experience and enhanced scenarios that will engage users in ways only possible with Microsoft Band 1 and Microsoft Band 2.

The Microsoft Band SDK gives developers access to the sensors available on the Band, as well as the ability to create and send notifications to tiles. Enhance and extend the experience of your applications to your customers' wrists.

Download the SDK

Additional resources