Spent today and a large part of yesterday chasing the holy grail of Dutch datavis (and did not wanted to stop before succes).
This is rendered in Processing from a dump from a Shapefile provided by the Dutch Statistics office. Data is dummy right now, but given a correct mapping we can hook anything up.
Processing is really nice to work with in Eclipse and I was surprised and glad that my Java-fu still seems to be strong enough. Full writeup, better results and code+data release to follow.