Get mobile alerts when a scam (like a door to door charity scam) is reported near me. Submit scam reports. Search recent and nearby scam reports.
Make widgets (e.g. WordPress widgets) that let local blogs easily re-use and filter open data sets for display on their blogs. For example, show recent crime reports by zip code.
A mobile app that finds my closest neighborhood block watch group, lets me join, lets me see which shifts are taken, and lets me sign up for watch shifts.