Do you frequent second hand book stores? Have you ever bought a book home only to find anything interesting within their pages?
You know, I haven't been to a second-hand book store in a long time. I used to go to Library sales all of the time, but I ended up with a lot of books I wasn't all that interested in (mostly because they were like $1). Since I am one of those people who tends to want to read the latest and greatest, the second-hand stores tend to have older things. Which is great and wonderful - don't get me wrong. It's just not my taste, so I don't go often.
Though, I do remember once finding a few pictures in one of the books I got at the Library sale. I felt bad throwing them out, but I can't imagine trying to find out who they belonged to. But that was all years ago. Perhaps I should frequent the second-hand shops more often :).