Open government data is important because the more accessible, discoverable, and usable data is, the more impact it can have. These impacts include, but are not limited to: cost savings, efficiency, fuel for business, improved civic services, informed policy, performance planning, research and scientific discoveries, transparency and accountability, and increased public participation in the democratic dialogue
In Local Government, City-Data provides detailed profiles of all cities, allowing anyone to find information such as demographics, crime rates, weather patterns, home values, cost of living and more
Have you used any of the following apps; Yelp, Kayak, LinkedIn, Realtor, FourSquare, Facebook, and Twitter? All of them share one thing in common. They are use data that is open by the government all the time. For example, when you compare airline prices for a ticket on Kayak, Kayak makes a call to the Federal Airvation Auhtority Open Database to find the information for all airliness registered with them and use that number to learn their ticket prices and etc.