In the INSPIRE framework we are working on the ESDIN project and are using the EuroGeoNames (EGN) project as an implementation of ESDIN. INSPIRE is a big thing within the GIS world in Europe and loads of documents have been written so far.
We’re involved in both ESDIN and EGN and we decided to use the latter as a trial for the first. Together with our partners we’ve setup a series of servers to fulfill the needs of the projects. The main standard used is the latest WFS and GML versions, which have the annoying disadvantage that there are few clients available.