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For pure, unbridled Wal-Mart bashing, this compilation
(PDF) of figures, studies, and talking points from the Brennan Center for Justice has all the information you need. It's not fair and balanced—why, no mention of the potential benefits
Wal-Mart can bring!—but it has some great tidbits, like: "In a study of over 3,000 counties, researchers found that counties with more Wal-Mart stores had a larger increase (or a smaller reduction) in the poverty rate between 1987 and 1999 than did counties with fewer or no Wal-Mart stores."