My latest DIY project: installing standard-and-bracket shelving. Each row consists of two 4-foot shelves, except for the lower right shelf, which I had to trim so it would clear the heat register. The twin-track standards are attached every 16 inches to studs.
If you're nosy, look at the full-size picture and see how many titles you can read! There's no ordering principle yet: I put books on in the order I took them off the stacks in the guest room.