This is just a note for a little gem I just discovered. The European Environmental Agency (EEA) has made available a set of map services for environmental data. Coming under the interesting name of Discomap (??) this free service is described as:
The EEA provides geographic information system (GIS) application programming interfaces (APIs) to obtain a wide range of environmental data for Europe, and helps users create their own map services. Map services available from Discomap are freely available for reuse. EEA content can be integrated in many different ways by developers or by end users who wish to combine EEA’s information with their own or other public map services (mash-ups).
You can find it at http://discomap.eea.europa.eu/