Interactive OpenStreetMap Progress Map
Create an OverPass API bounding box query of an area you are interested in with http://lxbarth.com/bbox/
Get data from Overpass API and convert it to geojson, passing in the start date that you're interested in.
curl http://www.overpass-api.de/api/xapi?map?bbox=-74.26,40.49,-73.7,40.92 -o nyc.osm python convert.py nyc.osm nyc.geojson 2012-01-01
(Required Python 2.7)
Make a copy of one of the TileMill projects, update #progress data layer source with the geojson file you just created, adjust colors and user names.
Render+upload to MapBox hosting