I believe this is where I found the info:
I set up a template column like this:
https://docs.google.com/viewer?embedded=true&url={Document}
And then I have a replacement set up to replace {Document} with the url of the PDF.
I also have it set up to show images and website links, so right now I also have an If Then column set up to search for ‘.PDF’ in the url and if it has it, then I use the wrapped version of the URL. Otherwise I just use the URL in it’s original form.
Just a word of caution, I did read in the stackoverflow forum that google may impose bandwidth limits for non-google documents. I am only testing this myself and I only have a couple users, so I’m not too worried about running into any limits. I haven’t looked, but there may be other wrapping services out there that would do something similar.