[ugh]

Links and history work as expected (at least in the browsers I know with native PDF support) and I’m not sure why it is bad that some users might not understand that a PDF document is not a HTML page.

I also don’t know how Scribd helps users understand that better. Seems horribly confusing to me if you don’t follow them closely. (Wait what? The PDF is suddenly a webpage? But sometimes Flash? I can still download the PDF? Why doesn’t it look exactly like the webpage? What’s going on?) It’s perfectly usable, even without a deep grasp of the concepts, but so are PDF viewers inside browsers.

[DougBTX]

The problem historically with plug-in PDF readers was that the Adobe one was very slow. That seems to be fixed now - though I can't tell if the software is better or I just use faster hardware.