I've been having this problem too, esp. since inheriting a third of Mom's "stuff"........what do I keep for posterity, what do I sell/give away? No answers so far. About once a year, I go through the books, and if I haven't cracked the cover in the last 2 years, off it goes to the Library Used Book sale, to make room for more. The only exception to this is my collection of Celtic/Irish reference books and music/tune collections.