While you may loose your 50 kilos of scribbled on print outs when you move to your next job, the digital equivalent of this may happen when you upgrade to the next operating system or change computer. You can, however, engrave the annotations in the PDF, at which point they can no longer be separated via the Skim export. Currently, if you open a Skim-annotated PDF with a different PDF viewer like Preview, you will see the bare PDF. It is also superior to a two file system of a PDF paired to a comment file. This is welcome since it allows you to remove your annotation before printing or passing on the PDF to a colleague. Instead, it attaches annotation info to the file. Skim doesn't change the original PDF like you can with Acrobat. dedicated pane listing your notes searchable and hot-linked.paper-like annotation including colour-highlighting, underlining, circles, boxes, full sticky notes, and anchored sticky notes that expand when clicked.easy searching using a pane on the left list all hits with page number and marks them clearly in the text after selection.