I didn’t actually think about this when I “rediscovered” OpenStreetMap the other day and wrote my blog post about it; there’s yet another feature that OpenStreetMap doesn’t offer… routing! I didn’t really notice that as I’m hardly using this feature on Live Maps or Google Maps, but in fact, there’s no from-to route finding service on OSM.
BUT luckily there is OpenRouteService, a free routing service that is based on (as you may guess) OpenStreetMap. Another great example of what to do with a free worldwide street database 