This website closed in January 2015. All GeoBase products are available on GeoGratis. ( geogratis.gc.ca ; GeoGratis API:
You can also access the data collections through Open Government of Canada the portal: http://open.canada.ca/en
GeoBase provides geospatial data of the entire Canadian landmass for government, business, and/or personal assessments of sustainable resource development, public safety, sanitation, and environmental protection. Data is available for download as ESRI Shapefile, KML, and GML.