The caterpillar robot is available as both an AVR and Picaxe based robot. The picaxe version can be bought from Revolution Education and various picaxe distributors. The AVR version can be bought from Arexx Engineering.
The caterpillar robot is the very first robot from the LMR website to be mass produced. As such, the LMR logo is on the box.
This is the first of hopefully many LMR robots to be mass produced. Frits's YDM and SplatBot MkII will also be produced.
18 Aug 2009: Here is a manual for the assembly of the caterpillar. The images are low resolution to keep the file small.