It's pretty slick, but the I couldn't find a way to go full-screen? Something like 15-20% of the reading space is with headers and footers that serve no purpose while actually viewing documents.

Compare Google Docs native PDF reader to yours [Screen shots here: http://imgur.com/a/mfVJx]. If I'm using a service to view documents, I feel like more real estate for the actual content would be more useful than social sharing or download links or whatever else.

You're absolutely right, we'll fix that soon! To get a better impression, you can open the widget link for now: https://my.doctape.com/s/8KL4bF?w=1

Is this using LibreOffice on the server to convert DOC to PDF or SVG or flash?

Is the source code available?

The viewer mostly based on PDF.js (http://mozilla.github.com/pdf.js/) with a customized UI. On server side, we leverage several components (incl. LibreOffice) to convert different document types to PDF.

wow nice!