I loved my IKEA MALM bed with bookshelves that slid neatly into the headboard (shown here). The headboard is a great storage piece for books and bedside items you want to keep within reach but are also easy to hide. Click through for a few more headboards with hidden storage.
• IKEA's MALM bed and headboard as shown in Rachael's Apartment Therapy Inspired Design Lab
• Stratton Smart Technology Headboard from Pottery Barn
• headboard with extending shelves from Gautier
• LittleMissMatched SKETCHoRAMA Twin Size Bookcase Headboard from the Headboard Store
• the back of a storage unit used as a headboard from Living Etc.