FormData
http://hacks.mozilla.org/2010/05/formdata-interface-coming-to-firefox/

window.atob / window.btoa
https://developer.mozilla.org/en/DOM/window.atob
http://demos.hacks.mozilla.org/openweb/imageUploader/js/extends/xhr.js

File Writer
http://www.w3.org/TR/file-writer-api/

File API
http://www.w3.org/TR/2009/WD-FileAPI-20091117/

Uint8Array
https://developer.mozilla.org/en/JavaScript_typed_arrays/Uint8Array