Making progress
Adding the links to the PLDD is itself not harmful. Then again, it's not as useful as it could be if you just add a link to the page and leave it at that. First thing you can do is to make people aware of the resource so that they can use it to write articles. WikiProjects are a good place to leave a note. Relevant ones include Wikipedia:WikiProject Middle Ages, Wikipedia:WikiProject Saints, Wikipedia:WikiProject Catholicism and Wikipedia:WikiProject Anglicanism. Most will have a resources page somewhere listing useful books and links, so mentioning PLDD in those would be helpful. If you have a look at the history tabs of the articles on relevant subjects, you can find editors who write about these things and may find them useful. Please don't go mad. A few messages will do: look at who started or expanded the articles rather than people who did spelling corrections or the like.

If you do add PLDD links to a page, and you can see that there's some resistance to that idea, you should probably do a few other things at the same time. Make sure the article has a section on the relevant writings (a bibliography of sorts). Link to the Patrologia Latina article and then you can work in a mention of the PLDD version. If you add a bibliography and the article has footnotes using , include a footnote and use the  or  templates rather than just adding a mention in "External links". Jonas of Orléans is an example where there are mentions of the works in the PLDD, and where adding a footnote saying where to find De cultu imaginum or De Institutione regia would be useful. This would be more work for you, but it would help us and our readers more. I will change Jonas tomorrow to show what I mean and let you know when done. If you have any questions, please let me know. It seems to me that the PLDD is a valuable resource for Wikipedia's editors and readers (or at least those who can read Latin), and it would be regrettable we didn't make as much and as full use of it as possible. Regards,   (Talk)