Basically Del.icio.us with only images, Pinterest's biggest problem is that it is a tool for reckless copyright infringement, Few users post any original stuff, and among these creative users, most are big retailers. Pinterest will eventually see big-time legal action. There is be many takedown notices, for sure. At least, Del.icio.us was better, it just had the links. Sadly, the new owners have killed what made Del.icio.us a king during its day.