QualityStreetMap
QualityStreetMap (qualitystreetmap.org) is a Quality Assurance tool for coordinating mapping work. It displays a large grid, now covering the whole world. Zoom to see it. Login with your normal OSM login (uses OAuth) and then click a grid square to indicate mapping progress.
Use the URL http://www.qualitystreetmap.org/osmqa/ with a lang parameter (eg ?lang=fr) to translate the menu options in your language (if available, it will also zoom to the european area where this language is spoken).
The idea was presented as one of the State Of The Map 2010/Lightning Talks. Read the slides on slideshare.net or view the talk on YouTube.
As it is a "work in progress", patches are welcome. Code is available at http://code.google.com/p/osmqa/ under the terms of the GNU GPL license.
Contact: User:Vdb
Mailing list: http://groups.google.com/group/osmqa-discuss