Clear your shelves.

I know that there are loads of charities out there at this time of year that need your support, but not all of them are willing to take your gently used paperbacks off of your hands. If you're looking to unload some books this season (maybe you're preparing your bookshelves for a massive infusion of literary Christmas presents?), check and see if there's a Books for Prisoners-style program in your area. Many prisons no longer have libraries, and that box of Michael Crichton paperbacks moldering underneath your bed might really brighten up some inmate's day (and possibly his future).