I have created a new LEGO Mindstorms robot. It is a classic tank-like / caterpillar design. 
You can download the Lego Digital Designer and LDraw files here. 
I have created builing instructions with LEGO Digital designer that can be downloaded here.
As usual they are horrible since you do not have any control over how they are created 🙁
Best idea is to download LEGO Digital Designer and study the model there. To download Lego Digital Designer please visit ldd.lego.com heise.de
Update: I have uploaded the code for this robot here
Diese Seite idd.lego.com gibt es nicht
Lego hat den DigitalDesigner eingestellt -> Zur Mitteilung von Lego
heise.de bietet den Download jedoch noch immer an -> Zum Download auf heise.de