Hello all, I have developed a client-side tile renderer for the WikiMiniAtlas last week. It enables me to support virtually limitless zooming in. GeoJSON data is generated from the osm-mapnik database and transmitted to the browser, where map tiles are rendered into canvas elements. This allows me to change the map style without and server side changes (re-rendering, cache purging etc.). I'm working on a set of styles to emphasize certain structures on the map (subways, tunnels, bridges, raillines, monuments, etc. ). Kolossos just posted about the visualization of time dependent data. My client side rendered tiles would support start_date and end_date fairly effortlessly. I am transmitting all data to the client anyways and could check for these time tags as well and display buildings accordingly (no prerendered tiles necessary, minimizing space requirements on the server). The client-side tiles are active now in WikiMiniAtlas so check it out if you are interested. Daniel
P.S.: just keep it in the back of your head: with WikiMiniAtlas there is another project bringing OSM data into Wikipedia...