Not familiar with forcast.io — thanks for sharing! Before I got into web development I worked at a company called Prologue doing motion graphics in After Effects and Photoshop. Even if you've never heard of them, you've probably seen their work: http://prologue.com/
This background is much of the motivation for the library.
Ah cool. Yeah, I instantly thought of use cases like Forecast.io's weather animations for your library. I think this is a _major_ trend about to explode, and approaching it with a JS library instead of animated GIFs seems like it has big potential.
Check out www.forecast.io to see the UI polish I'm talking about.
This background is much of the motivation for the library.