A couple things related to OpenStreetMap Notes.
> SOTMEU Dundee talk about notes - Slides & Transcript.
> Notes Density Map - A density map of notes, open notes in red, and closed notes in green, rendered as zoomable tiles.
> Notes Free Radius - Share your progress with closing notes near where you live or work.
> KML Notes - Download notes as KML which opens nicely as a layer of bookmarks with the Organic Maps app.