I am wondering if anyone knows where to find building footprints, road network, transit, or environment feature data for Curitiba, Brazil.
Check out the Brazilian Institute of Geography and Statistics (IBGE) web page. Also take a look at the statewide data for the state of Parana at GeoComm (aka GIS Data Depot). USGS Earth Explorer has great global remote sensing products. The screenshot shows a downloadable Global Land Survey dataset over Curitiba.