Today, the Canadian Labour Congress celebrated Corporate Tax Freedom Day -- defined as the day on which corporations have paid their share of all government taxes. It featured a race of mechanical pigs to a trough full of cash -- with the pigs wearing the colours of leading Canadian corporations with large cash reserves. The winner? Potash Corporation of Saskatchewan, with over $5 billion of surplus cash on its books at the end of 2010 (and that was after a $2-billion purchase of their own shares.)