The New York Review of Books: Inside the Leviathan - a good article detailing many of the costs we all incur through the existence of Wal-Mart and their practices.
Here are two quotes:
"One of the most telling of all the criticisms of Wal-Mart is to be found in a February 2004 report by the Democratic Staff of the House Education and Workforce Committee. In analyzing Wal-Mart's success in holding employee compensation at low levels, the report assesses the costs to US taxpayers of employees who are so badly paid that they qualify for government assistance even under the less than generous rules of the federal welfare system. For a two-hundred-employee Wal-Mart store, the government is spending $108,000 a year for children's health care; $125,000 a year in tax credits and deductions for low-income families; and $42,000 a year in housing assistance. The report estimates that a two-hundred-employee Wal-Mart store costs federal taxpayers $420,000 a year, or about $2,103 per Wal-Mart employee. That translates into a total annual welfare bill of $2.5 billion for Wal-Mart's 1.2 million US employees"
"The exploitation of the working poor is now central to the business strategy favored by America's most powerful and, by some criteria, most successful corporation. With the re-election of a president as enamored of corporate power as George W. Bush, there is every prospect that this strategy and its harsh practices will continue to spread throughout the economy."
Another reminder that we shouldn't shop at Wal-mart (I did once about 2 years ago, but haven't since) and why we should discourage our friends from shopping at Wal-Mart.