I'd love to have an app that would tell me what's happening near me right now. It would filter out everything except the topics/events that I'm interested in. With the app, if I find I have some time available, I would know what options I have available.
it depends on how you frame it. I just want to know the problem(s) that you find infuriating or lacking in your day to day that could be solved with a web based app.
It's different for everyone of course. I have just finished a contract and am looking for something fun to make while I take a few months off - so I'm interested in anything and everything :)