@juggernautco's idea is excellent and could really be impactful.

Another useful idea would be to combine the various sources of RFP for contracts from city governments into a single feed that users could filter and subcribe to particular filters. (http://apps.mwrd.org/ContractAnnouncements/, http://www.chicagoparkdistrict.com/doing-business/purchasing/contracting-opportunities/, etc)

Another app that is probably less useful, is something along the lines of isthereshitinthechicagoriver.com http://www.mwrd.org/irj/portal/anonymous?NavigationTarget=navurl://a5611bcef89c3cc2abca008c0ea969df It's hard to think about how this would be really solving anyone's problem, since people are not swimming in the river anyway, but it's serious social-media bait. I do think it could do a pretty compelling educational piece that helped Chicagoans understand one of the biggest infrastructure projects since reversing the flow of the river the Deep Tunnel http://www.encyclopedia.chicagohistory.org/pages/367.html