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spin.js
fgnass.github.com/spin.js/, posted 2011 by peter in animation css design free html javascript opensource
Features
* No images, no external CSS
* No dependencies
* Highly configurable
* Resolution independent
* Works in all major browsers, including IE6
* Smaller than an animated GIF (3K minified, 1.7K gzipped)
* MIT License
...
How it works
Spin.js uses the CSS3 to render the UI, falling back to VML Internet Explorer. If supported by the browser, @keyframe rules are used to animate the spinner.