Besides the 50%-400% zoom range options, Evince has two special zooming options: Fit Page Width and Best Fit. To me, the first one is very clear as to what it does, i.e., zoom the page so that the side margins fit the app window, but the latter is quite confusing. The term "best fit" is very relative and vague. It does not explain what this zoom option does - zoom the page so that the top and bottom margins fit the app window. The image below illustrates the issue.

I love PDFs due to their computability with other OSs. It would be great if selecting text in the document viewer worked more effectively. I am always reading research papers that have multiple columns and when I try to select text it goes all crazy and selects entire columns or does not realize there is a column at all and continues selecting text until the end of the row.

Also, sometimes when I select text to copy it to another location, 8s turn into boxes or Ns turn into Rs. Some weird stuff happens.

I love how there is the ability to select text, but to make it truly useful these things should be implemented.

Lastly, if the default "Print to file" was PDF instead of PS (PostScript), I think more people would find it useful.