It comes from spending time in some domain, like wikipedia, photo sharing, forums, shopping etc... You don't just come up with an idea out of the blue, you do s

It comes from spending time in some domain, like wikipedia, photo sharing, forums, shopping etc... You don't just come up with an idea out of the blue, you do something long enough and you'll have an idea in that domain and have a few hunches on how to execute it well. There was a TED talk about how people come up with ideas, can't remember what it's called. Basically ideas take time to develop just like everything else, they only seem like eureka moments because they sometimes come about when you're not focused.