I absolutely love this idea. When I first saw this, I thought it was a bus stop. It's not, but it probably should be.
It's a portable park based library in Columbia. They have about 100 around the country to encourage literacy. Each are staffed with a worker who receives a small stipend. It wouldn't be hard to redo these as library vending machines in urban locations. It would make waiting for the bus much more relaxing and attractive.