The CanVec dataset will be merged into the OpenStreetMap database, over the next 2 years (i estimate on how long it should take) http://wiki.openstreetmap.org/wiki/CanVec
For those interested im helping out, feel free to just ask on the OSM mailing list. (this link can be found on the CanVec wiki page) this website does not allow for more than 1 link.
And BTW the CanVec dataset is derived from multiple datasources, including GeoBase.
Best, Sam Vekemans Across Canada Trails Working on OpenStreetMap in Canada