British Columbia will have Canada's toughest impaired driving penalties when new laws become effective on September 20, 2010. The limits of zero for new drivers, 50 mg% (.05) for a 24 hour suspension and 80 mg% (.08) for criminal impaired driving charge have not changed, rather the penalties for those who disregard them have become much harsher.
One can still have a glass of wine with dinner or a coffee containing a liqueur after it and not run afoul of the limits, but it is wise to leave it at the single drink if you absolutely must drink and drive.
Links:
Read the B.C. Government Press Release
More Information from the Superintendent of Motor Vehicles
Bill 14 2010 - Motor Vehicle Amendment Act