Webmeister mentiones the Tiny Geocoder, a tool to get geocoordinates after passing an address. Such geocoding, of course, is needed for many Web 2.0 geolocation based services. Unfortunately, you need huge amounts of data before you can create such a service.
While openstreetmap has data down to street name level, we still lack housenumbers. And it will last a while until we have them in our database. But: We will have such data. When? We will have 98% of all housenumbers for germany in two years. Sure? No. But likely.
