This site is run by a guy called Jean-Claude Wippler, he has created his own version of the Arduino called the JeeNode.
It uses the same programming IDE as the Arduino.
The pinout interface for the JeeNode is quite different to that of the Arduino, he has setup 4 ports that can be connected to various sensors like temp, humidity and many more using I2C. To make programming easy he has also built a ports library.
The wireless interface is also made easy to use with a custom library, this enables you to send and recieve serial data without worrying about any data protocols at either end. Each device comes pre-programmed with the libraies needed and can talk to each other out of the box, all you need to do is follow the tutorials on the site.
The other thing that interests me, when combined with the wireles capability, is the nice graphical LCD screen.
|Complete Wirelss screen|
I found all this at Jeelabs, based in the Netherlands.