I used to hate PDF files, more recently I have started to appreciate them a little bit more. Mainly as we now tend to have faster internet, and computers that can display the files with out too much delay. It's interesting to see that others still have issues with PDF's too.
Contentious - No PDF Press Releases
Another Surprising issue that I have come across is the number of people who don't know what a PDF is, and don't even realize that the Acrobat (aka PDF) file they read inside their web browser is any different to the other webpages they have viewed. I'll bet this is great for Adobe, but because of its wide spread use, every windows user is forced to install Acrobat reader on their computers! This does not give us much freedom of choice.