We all know the workflow: a collaborator sends a draft proposal or paper; we carefully read it; bleed all over it; and send it back. I admit that until last year, I used a Big Red Pen on hardcopy, which I then returned to the lead author by scanning with the xerox machine.
Recently I switched over to marking PDF files using the Annotate menu in OS X’s Preview app. It’s pretty good, if a bit clunky. But maybe there’s a better way?
So let me ask an innocent-sounding question: What’s the best tool to annotate PDFs, and why? Why do you use the tool you use?