For me, Pinterest works exactly how I want it to - as a store for inspiration images. I use it heavily for storing concept art to later draw inspiration from when doing game design, digital art, or screen-printing designs. Granted, I don't find the search helpful at all and the embedded pins are terribly irreverent and annoying.
If you are a Pinterest user and are interested in a large collection of fantasy/cyberpunk artwork, you can see how I use it here (registration required of course):