When I upload PDF to Google Docs (using Python's gdata library), I get link to the document:
>>> e.GetAlternateLink().href
Out[14]: 'http://docs.google.com/a/my.dom.ain/fileview id=<veery-long-doc-id>&hl=en'
Unfortunately using that link in IFRAME is not working for me because PDF viewer is redirecting to itself, breaking out of IFRAME.
Looking for the solution, I've found this: http://googlesystem.blogspot.com/2009/09/embeddable-google-document-viewer.html - which looks very nice, but I can't find a way to use it with document uploaded to Google Docs. Does somebody know how to do it/if it's at all possible?