Most projects start when someone has an idea he thinks will solve a problem. Then if he’s smart, he’ll try and test this assumption. What if we reverse the model?
An online service where we invite people to come and tell us what they want or need and can’t find (or can’t find anything good or close enough.) When you get many these that are centered around what seems like a unifying problem, do a deeper dive with those people, asking them for more and more insight into what they really need/want, what is their true problem and motivation (emotional as well as functional.) Based on these a more coherent idea can be formulated and then tested more widely. This might help uncover much more such problems and ideas than just starting with a thought.