My sisters and I used to play "librarian." We each owned a handful of books, and we took great care in lending them out to each other, noting due dates and charging fines for late returns. It was all very delightful. I think I still have an outstanding fine of 30 cents.
Perhaps all bookworms aspire to become librarians at one point or another, enticed by all the books and the mandatory quiet. Many become editors or proofreaders, able to identify misspellings viscerally through years of unintentional study. Terry Ballard appears to be a bookworm-cum-librarian who documents typos in library databases. For fun.
The main list, "Typographical Errors in Library Databases," is a bit yawn-inducing, but the follow-up page is worthy of a scan.