Take your n810 out and mark your favorite restaurant on OpenStreetMap, enter your childrens playground to the database, map your entire neighbourhood or just correct this OneWay that recently changed direction.

Screenshots from different versions:

More details can be found on the authors site , however the current version includes:

• Down- and upload from and to openstreetmap directly from the device
• Editing of tags (e.g. to name an object)
• Create, modify and delete nodes and ways
• Move stand-alone nodes as well as nodes forming a way/polygon
• Clear and simple map view
• GPS track display and live GPS view
• Download of WMS data (e.g. satellite images) as background images
• Uses JOSMs presets.xml and related icons for tag presets
• Project management