When you do a Google search for something and the results contain a PDF file, there's an option in the search results to view the PDF file as HTML. The results are often none too good.
Seems like it ought to be possible for the program used to design the PDF file in to allow adding hints on how to display the information as HTML, thus reducing the need to resort to using Adobe Reader or the equivalent to view the file with. This would be vaguely similar to the way that font files contain hints on how to optimize the font display on different devices.
I really hate it when I come across a pdf file in search results. People are generally not going to print most of the files, so why create them for printing instead of designing them for convenient viewing onscreen?