Use Google Docs Viewer: Insert>More Gadgets, search for Google Docs Viewer Insert it and configure it with the Download link.
How to include a PDF in a page
- Upload your PDF file to your site. I uploaded this one as an attachment to this page.
- Right-click on the PDF's download link and capture the URL.
- Insert the Google Docs Viewer Gadget. (Insert, More gadgets, find Google Docs Viewer and get the one created by Mori. Insert the URL you captured to content box.
- Click OK and save the page,
See Mori's How-to here.
See Phil's How-to here.
You can also include external sites.
Scroll down for an example...