Thanks to a user, PDFs now have thumbnails! I'm happy and surprised with how this turned out. The module it uses also offers raw text access, so I have rejuvenated a I-think-good-enough 'num words' count for PDFs. Also, PDFs can have a little embedded metadata like Author and Title, and this is viewable on the special button at the top of the media viewer. On update, all your existing PDFs will be scheduled for some file maintenance work to figure all this out, so give it a little while to catch everything up. As always, please send in any PDFs that get weird results. I expect we'll do a little more here, particularly pulling the embedded data into hydrus proper as tags etc...