This wiki is no longer maintained as of April 2012. Existing users may update articles, however user registration is disabled.
Keep Right is a data checker for OpenStreetMap.
Keep Right runs checks on OpenStreetMap data, flagging possible errors with map markers that can be clicked on for more detail. Many of the checks it runs are very difficult to check manually making it a valuable resource to make OpenStreetMap data as complete as possible.
Keep Right has grown over the two years it has existed, and finally achieved global coverage in October 2010. 
Keep Right is a tool for OpenStreetMap produced by a single person in their spare time. It is a great aid to maintaining OpenStreetMap data.
Keep Right - OpenStreetMap Wiki