Waze is here for Windows Mobile and Symbian users, Waze is the first free turn-by-turn GPS app that uses crowd sourcing to detect real time traffic conditions. Users can also communicate information to each other about whats happening on the road (police, accidents, construction, cheap gas etc) straight from their phones in real time.
Right now they are looking for alpha testers in the US who would be interested in trying the app before a public version goes online. Users can register for the alpha here: http://www.waze.com/alpha_register/
If you give it a shot let us know about your opinion about the app.