You are spot on. I've always found this frustrating - hackers beat their heads on walls looking for new consumer ideas, while deep in the industries there are relatively simple problems left and right. I think the frustration is on both sides - hackers would love to solve these hidden problems, and the business folks would love someone to make their lives easier.

PG said it best, "build something people want": it's the hardest thing for a start up to do. So the idea of all these hidden opportunities just kills me. If someone wants to start a website that publishes these type of ideas, you'll have me as a user.