I never used it until someone who I asked to decorate my apartment got me on it, and we would start pinning things we liked or find tasteful and comment on them. Then it was really handy. You could have boards for the kitchen, bedroom, artwork, etc. Really useful, especially to keep a record of things you need to buy eventually too (this is what it looks like, and heres the link). I think it's likely a great professional tool for interior decorators, designers, contractors, etc.