From the perspective of an entrepreneur, an idea on its own is not worth much. To be valuable, the idea has to be nurtured through to a product or a process, and then on to adoption by your end users.
In the “Web 2.0” world, there are lots of new ideas, but very few gaining particular traction.
Andrew has an interesting article examining the difference between an invention and an innovation:
Inventors must start with a world of possibilities and work to create new ideas, patents, prototypes or processes, and propose that other people should consider their contribution to the world (often through publication). Innovators take a possibility or idea, often one that inventors have already proposed, and turn that into something that they follow through to adoption.
Which are you working on?