Yeah, looks like Nominatim is pretty broken still. Last update: 2011/08/19. :D

Don't do that. It show up in the search just fine. On osm.org you have to press "More results" to get "Town Columbia, Boone County, Missouri, United States of America" which links here: osm.org/?minlon=-92.433837890625&minlat=38.8635368347168&maxlon=-92.2276153564453&maxlat=39.0294036865234

If Navit doesn't show enough detailed information then that is where the fix should go.

Could be that the southwestern lopp has been removed. Found this photo from 2010 http://foto.ceskedalnice.cz/vase-foto/10/101012-D8/slides/22.html where the northwestern loop is under construction and the lower road is partly removed. So in this case I believe OSM to be more correct.

Sorry alexz, didn't see your links as I hadn't scrolled down. That is a clear example of copying. I apologize for my hasty comment. :)

How is it copying if he's tracing from an sanctioned source or from surveying/GPS tracks?

Don't know if I'm misinterpreting you but to pan in JOSM just hold down the right mouse button and drag.

I don't either see a problem in having a lot of details for non-street objects. I regularly use OSM when out hiking or biking and it is nice to have a lot of small details to help locate yourself even if you have GPS lock. However, it's best to keep the general detail level of an area the same when mapping.

BTW, real, non-reduced, admin boundaries can be quite weird sometimes. :)

Looks OK here now. Just one tip though: add the tags to the relation instead (no tags on the outer way). This seems to avoid some render bugs.

E.g.

[outer way]

[inner way(s)]
foo=bar
source=imagination
…

[relation]
building=yes
…

I've been doing a bit of armchair mapping in and around Guimarães. I'm a bit confused about the usage of the different highway classifications in Portugal though. Seems there are a lot of roads tagged as tertiary around Guimarães that I'd personally would tag as just residential/unclassified. Perhaps I'm just too used to mapping in Sweden and Finland where there are significantly fewer roads. ;)

I found the Portugese wiki page here on OSM and used Google translate to try and understand when to use the different highway values in Portugal. However, it would be nice if someone who spoke Portugese or is involved with Portugese mapping could add a proper English translation. Would be a lot easier to help then. :)