Nanode is a very low cost internet connected microcontroller board - compatible with the Arduino programming environment. It allows applications for internet remote monitoring and control to be developed on a familiar low cost platform, such as web servers and clients or for data exchange and control using services such as Pachube.
You can keep updated on the Nanode Project at the official website and also on the Hackerspaces Wiki.
The EagleCAD schematic and board file have been uploaded to my Thingiverse account. Here's how to build a Nanode - takes about 90 minutes.
Follow the Pictorial Guide on the London Hackspace Wiki for full instruction of the Build Sequence.