IT services companies are responding to client needs by building green IT and corporate sustainability practices. We continue to forecast very healthy growth — 60% CAGR —for this market, peaking at $4.8 billion in worldwide user spending in 2013. Since our initial overview last year, new vendors like Cisco, Infosys, and Wipro have jumped into the market, which continues to be shared among data center design specialists like Dell and Sun and corporate sustainability consultants like Accenture and Capgemini. We recommend that vendor strategists and green practice leaders continue to broaden their service offerings, helping clients to fit green IT within a broader context of corporate sustainability initiatives.