I'm not sure how they justify their claim that the Mac Mini is the most power efficient desktop. According to another post in this discussion, the average draw under load is approximately 35W. The Lenovo M58 & M58p--which have been out since December, 2008--also draws an average 35W under load, and are also EPEAT Gold and Energy Star 5.0 rated. I believe HP has had a similar product for a while too; probably every PC maker does.