I have an iTunes library which contains many PDFs, but for some reason they don't show up in the "Books" library section, but rather in "Music". The rather cumbersome workaround to this is to drag the PDF files over to the Finder desktop, delete them in iTunes (taking notes of which playlists they belong to etc.) then drag them into iTunes again. This time they magically pop up in the "Books" library section. I'm hoping there's a simpler way to make PDF files go into the correct library section -is there? (the reason this is a problem is because I've tried to move (export) my iTunes library to another hard drive, only to find out that all my PDF files were missing! However, I tried to insert (drag from the Finder into iTunes) a PDF file or two (for testing purposes) before exporting, and they all came through fine).