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Google announced that the SDK for the $35 Chromecast is going public today. Any developer interested in updating an app or optimizing a website for the streaming dongle is now free to do so.

Receiver app support
You have many options for displaying content on Chromecast. For simple media applications, you can use the default media player that can play back HTML5 media content. You can also customize it with your own branding and style using CSS.

For non-media applications, or for more flexibility and design options, you can build your own custom receiver application using standard web technologies. With a custom receiver you can build virtually any application while including support for many streaming protocols, including MPEG-DASH, HLS, and Microsoft Smooth Streaming, all of which are available in the Media Player Library.