The Netzer Breakout enables quick development of circuits arround the Networker.
The image shows a functional block diagram of the board.
The extension port has an important role. Depending on the application several extension boards can be put in the socket. Extension boards for LCD and domestic (relays, temperatur and light sensors, opto decoupled inputs) are in development.
For new Eagle projects here is Netzer in an easy to use library (Release from 2011-07-01): Open (Eagle version 5.X)
Also included are footprints and device for the extension port to develop own extension boards for the breakout.