BranchenIndex
This is for german folks mostly: The Vieweg+Teubner publishing company is going to put a “Branchenindex Energie- und Umwelttechnik” online. My understanding is that this will be an online database containing addresses of companies in the fields of water-/sanitary- engineering, recycling, and renewable engery. Supposedly the service will be online starting in May 2009.
See announcement and main site.