"You may not use the Service to develop a visual document search and preview application which embeds multiple uses of the Google Docs Viewer in a single webpage for DOC, DOCX, or PPTX filetypes."
- Google Docs (view on Google Sidewiki)
So this terse statement is to prevent the user from doing something, but without really saying what not to do. I get the logic for that, because a note the says "Do Not Turn Off", will invariably get someone to flick the switch. So this is my layman's understanding of this legalese:
Please limit yourself to embedding the Viewer just once per page for files (DOC, DOCX, PPTX).
And what is this visual document search and preview? It sounds like I want one of those.