Today the Department of Energy's Building Technologies Program launched the Zero Energy Buildings Database with an offering of three Zero Energy Buildings (ZEBs) and one near-ZEB. A lot of work has been put into defining ZEBs and you can learn about the different types at the Net ZEB page. Also make sure to look at the overview page for each building to learn the associated types of ZEB. The Zero Energy Buildings Database is part of the High Performance Buildings Database and is hosted and maintained by BuildingGreen in conjunction with the Department of Energy.