I just got around to checking out Permanent Record, which is a blog written by Paul Lukas of UniWatch fame. Here is the address: http://www.permanentrecordproject.blogspot.com/.
As someone who is also fascinated by print culture ephemera, I think Permanent Record is fantastic! The blog’s description mentions writing about topics including “things left inside of old books,” which is a subject near to my heart. I sometimes intentionally leave a variety of paper objects in my books, including receipts (especially if I bought the book at a memorable bookstore), plane ticket stubs, business cards, cut-out New Yorker cartoons, and so on. That way, whenever I die (which is when I will get rid of my books, no sooner), some of my books will have interesting things in them for their new owners to discover.