Postal codes by federal ridings (2003 representation order) file (PCFRF) tools - I have had a few people ask about it, so I decided to publish the tools I created. If you use this, please let me know and please send any enhancements.
Please also consider lobbying the government to fix the fact that this database is excessively expensive rather than it being free and shareable.
See the CivicSpace posting for details.
Download tools (updated periodically): digital-copyright.ca/pcfrf/pcfrf.tgz [Digital Copyright Canada]