According to the New York Times, a secret Walmart memo reveals the corporation had numerous plans to hold down expenses by engaging in unfair hiring practices and by trying to reduce employee benefits.
Also, two websites I've discovered recently focus entirely on Walmart news, and both have rss feeds. Visit Walmart Watch for reference materials and activism, or get the latest news from The Writing on the Wal blog.
Ooh! I saw the NYT article. I highly recommend checking out the "MAO-MART: Always outsourced to Communist Slave labor. Always." campaign by Whitehouse.org
Yes, they're selling merchandise, but I suppose anyone with a bit of creativity could make their own MAO-MART items.
http://www.cafepress.com/thewhitehouse/740289