Hi all,
First time poster. I have been looking at some of the excellent work from the Keepright team who tag potential OSM mapping errors, all 37 million of them, at http://keepright.ipax.at/report_map.php. One of there side products is the density of nodes per every 0.1degrees.
I have mocked up an interactive choropleth map of Australia and this is located at https://ewen.cartodb.com/viz/043f80dc-554b-11e5-9fd2-0e9d821ea90d/embed_map for the next month or two. Some of you might be interested how Australian mapping is unfolding. It is only really useful at a state level or above.