funny stuff. recently - after almost 3-year long break - i've been able to reproduce very similar thing i did during my business trip in switzerland (http://www.openstreetmap.org/user/Jose%20Riha/diary/7324). of course this time it was a different company, different location, different osm mapper.. shared factor is a very friendly attitude of both guys.
during my 2 weeks long stay i've been able to trace 90+ km and add more than 2200 housenumbers in bad vilbel together with a few pois and osm features (mostly shelter yes/no or opening hours). without help of Schwoggel who risked it and borrowed his bike to a total stranger (read: me) i would only be able to map a fraction of it and even though there is still much work to do in bad vilbel especially siedlung heilsberg improved a lot.
thank goes again to Schwoggel & his family for his/their openmindness and very nice "after-party" dinner :-)