pdfs are like little browser freezing bombs on the internet, user’s are annoyed when the click on one because of the lag and delay. We need to tag the mouse cursor to indicate that a PDF is going to load.

I definitely agree with this one. The same problem occurs with mailto: links, something I wrote about a few months ago.

Another problem I’ve run into recently is the open/save dialog when you download files, which I actually just posted on today.