Rajesh Jain points to this interesting site which is a open-source idea collection. It has lots of ideas which solve common problems we face daily. It is the site for the book, “WHY NOT? How to Use Everyday Ingenuity to Solve Problems Big and Small” – by Barry Nalebuff and Ian Ayres. Some sample ways to innovate are according to the site are: Imagining how a consumer with unlimited resources would act. Forcing the cost of inefficient practices to the surface is another way to solve problems. Start with a solution from another context and searches for a problem it might solve somewhere else. Looking for potential symmetry and then turning things around offers unexpected solutions. More info with examples. HalfBakery is an other site on similar lines.