And done! It's made in plain JS (without any framework), CSS3 and the HTML can not be simpler, check the exemple page, the code on GitHub or the Forrst post.

The old jsFiddle is available here

Original image
(the original gif by @jessedodds).

I'm currently working on the upload, the code will be publish soon, the actual code only works on Chrome (maybe Safari).

http://calvein.github.com/Simple-uploader/