The site is similar to http://www.giftmedialist.com as well as a much smaller version of http://www.mediamap.com. GreenMediaList.com is going to sell a database of key media contacts who cover "Green" and/or environmental issues for newspapers, magazines, etc.
This site/company is tied to another Green company I run, GreenforGood. It would be interesting if we can try to tie in the existing logo for GreenforGood.com (http://www.beta.greenforgood.com) or something similar into this new logo.
PR and marketing professionals purchase these types of directories because it saves them time from conducting the research and allows them to contact reporters directly if they have a Green product or service for which they want to receive media coverage.