That said, being more transparent in the Readme on Github about the browsers that are currently supported and that plan to be supported would be appreciated. Blob is only Chrome 21+, Firefox 13+ and IE 10+ according to MDN (https://developer.mozilla.org/en-US/docs/DOM/Blob), and judging by the "FileBlob API is not supported" comment under the TODO section, there isn't any backwards compatibility yet. How far back are you planning on supporting?
I ended up using filepicker.io, and am quite happy with that now. But this gem could be good for people that don't want to rely on a third-party (although I still recommend trying filepicker.io)
BTW, the text does not scale up. And anyone have the name of the website that reformats a page with good CSS, just for future reference.