What is the most amazing DIYcity idea you've got? The thing you've been thinking about building for years, or something just off the top of your head right now. Let's have it.
The first response to DIYcity Challenge #1 was TrafficTweet, a Twitter bot that allows people in NYC to tweet updates to each other about traffic conditions. See DIYcity post about it here: http://diycity.org/challenge-response/first-response-diycity-challenge-1...
Good idea - what are some ways this could be made more useful to people?
What would keep you from using it?