Many people are wondering how they can get directions with OpenStreetMap. Currently, there is no ‘directions feature’ on the website, OSM.org. However, there are methods to get directions based on OpenStreetMap data. Probably the most sophisticated web solution is open.mapquest.com.
You can enter a starting point and a destination, either as an address or POI. Alternatively, you can right-click on the map and select a location as a starting point, and a destination respectively. Directions can be optimised for cars, bicycles or pedestrians.
If you want to report a problem with the directions you can do this in MapDust.com or directly in open.mapquest.com. Also, if you want to work on routing problems, MapDust shows you all the reported problems and gives you the opportunity to adjust a route around a problem to see how the map redirects the engine functions around the problem in real-time. More information can be found in the wiki resource.
Update:
There are other tools that might be wortg trying e.g. http://maps.cloudmade.com/ or http://www.openrouteservice.org/
Mapquest link is broken. Should be:http://open.mapquest.com/
Hallo,you should mention http://www.openrouteservice.org/ and http://maps.cloudmade.com/ as well, which are worth trying…
http://www.yournavigation.org/ is another option
OpenRouteService isn’t work mentioning as it doesn’t support turn restriction relations.