Lately I gave ShutterStem a little TLC to fix some issues (broken maps due to CloudMade shutdown, URLs hardcoded to my dev environment, etc.) and posted a rough demo: http://demo.shutterstem.com/
This project still needs some "constraints" to focus development efforts. Ideally it would be a home/portable appliance but OTOH it'd be nice to find a "minimally viable" subset of goals to tick off along the way.