Create a 360 Degree Image is a free, neat little tool that allows you to create a spinning 360 degree image. Take a series of still photos from all sides of an object and upload. The more you pictures you take, the better the effect. Picturecloud will mesh your photos together and create the 360 degree image for you.
The site recommends using it to sell products, but I think it could also be neat for a virtual tour of, say, a law library.