Companies are touting their "green" in an effort gain customers and raise awareness of their eco-responsible ways. AMD got into the act earlier this month with billboards launching in Times Square and Silicon Valley that feature a ticker of cost savings in data centers using the Sunnyvale-based chipmakers Opteron processor. And non-tech companies like Wal-mart are following suit by announcing strategies to save electricity and cut $300 million in fuel costs per year from their budget.