So I visited User:Mala in Poznań for the weekend (which we stretched to four days) and together we had our first formal Mapping Party, in the sense that more than one person had been out in the "real world" at the same time in the same place, with the specific goal of putting stuff on the map. We've been writing down everything and more, and then loading up JOSM on my laptop and mapping it before wandering off too far so if we had any doubts (my handwriting is really bad) we could just look again. The density of amenities and POIs in the centre of Poznań is such that you can map a whole lot without walking a distance longer than 100m. This also means that most stuff will not get a chance to render on mapnik because the renderer tries to avoid drawing things one on another, but this is what the centre looks like now:

osm.org/go/0ORAyZuhg==
(compare with osmarender)

In two weeks Mala is visiting me in Warsaw and hopefully we can do the same to the Warsaw Old Town market square which, like the Poznań Old Market is all pedestrian traffic only so you don't go there often except for tourism and so the seemingly busy and historically rich area is not really well mapped (osm.org/go/0Oy6Vx9yh==?layers=0B00FTF).