Lawns and lawn care are included in any good book or website about "green", "eco-friendly" or "sustainable" gardening.
Owen Dell did a great job with his Sustainable Landscaping for Dummies. Here's a review, with great discussion in the comments, including Owen's reply.
The Sustainable Sites Initiative has some great case studies with photos. They're a joint project of the U.S. Botanic Garden, the American Society of Landscape Architects, and the Johnson Wildflower Center.
The Green Gardener's Guide: Simple, Significant Actions to Protect and Preserve our Planet by Joe Lamp'l is another great all-around guide to eco-friendly gardening.
Susan Harris's Sustainable Gardening covers the spectrum, including Lawn Care here and Lawn Substitutes here.
The EPA's Greenscapes program for home landscapes includes advice about lawns.
Sustainable Gardening for Florida by Ginny Stibolt is hot off the presses - after being vetted for accuracy by all of academic. It's getting great reviews and we think it'll have impact. nd here's Ginny's podcast on Sustainable Gardening.
