I recently started working at Google on the Google Cloud Storage platform.
I wanted to try out the experimental Cloud Storage JSON API, and I was extremely excited to see that they support CORS for all of their methods, and you can even enable CORS on your own buckets and files.
To show the power of Cloud Storage + CORS, I released an example on GitHub that uses HTML, JavaScript and CSS to display the contents of a bucket.
The demo uses Bootstrap, jQuery, jsTree, and only about 200 lines of JavaScript that I wrote myself. The project is called Metabucket, because it's very "meta" - the demo is hosted in the same bucket that it displays!