pdf.js is a technology demonstrator prototype to explore whether the HTML5
platform is complete enough to faithfully and efficiently render the ISO
32000-1:2008 Portable Document Format (PDF) without native code assistance.

You can read more about pdf.js here:

http://andreasgal.com/2011/06/15/pdf-js/
http://blog.mozilla.com/cjones/2011/06/15/overview-of-pdf-js-guts/

Or follow us on twitter: @pdfjs

http://twitter.com/#!/pdfjs