spatialhast

    map.on('moveend', function() { 
        updateMapLayer();
    });    
    
    var dataBounds, zoom, dataUrl, dataType;
    function updateMapLayer() {
        // W, S, E, N
        dataBounds = map.getBounds().getWest().toFixed(5) + ',' +
        map.getBounds().getSouth().toFixed(5) + ',' +
        map.getBounds().getEast().toFixed(5) + ',' + 

spatialhast

Simple command line script to create UTFGrid json files from a polygon shapefile.
https://github.com/Ecotrust/create-utfgrids

Mapnik
# sudo apt-get install python-software-properties
# sudo add-apt-repository ppa:mapnik/nightly-2.3
# sudo apt-get update
# sudo apt-get install libmapnik libmapnik-dev mapnik-utils python-mapnik

Python OGR