In one of my niches PDFs have become wildly popular by G after Panda. All the sites that ranked high via HTML are now on page 2 rankings and all the PDFs have jumped to the top.
I can see how users like it. But I use to get complaints that it took too long to load. It also was ridiculously hard to monetize PDFs without using frames.
All sites that I have seen in the niche try to use frames or monetize PDFs in anyway have had their rankings tank. So I never made the jump.
It's getting to the point where I have to make the move to PDF. But how do you monetize it without frames? I'm thinking maybe a pop-under? Any ideas guys?