I wrote a whole post about swapping your bookcases for wall-mounted shelving. Wall-mounted shelving takes up less space, and can almost appear to blend in with the wall. Image from Stadshem, via Freshhome.
Small Space Secrets: Swap Your Bookcases for Wall Mounted Shelving. Here's a creative shelving arrangement that uses a deeper shelf at bottom to create a sort of bench. The bench can serve as extra seating for parties, or as a display space.
Struggling to decorate your long, narrow hallway? We have 19 long narrow hallway ideas that range in difficulty. From painting one wall to adding a long runner, we've got you covered. Turn your hallway into a library, or add shoe storage.
this is how we do it --- my books, and your records - A faithful shelving system bearing its load of books, vinyl and audio equipment. Notice the semi-wall mounted structure with stabilising feet for the heavy load