[Tecnochicken] has challeneged his arduino and robotic skills in developing a tree-climbing robot based on a L298 H-Bridge Motor Driver and some design time in Sketchup.

After I got comfortable programming and building with an Arduino, I decided to build a robot.  I did not have any particular type in mind, so I wracked my brain (and the internet) for cool robot ideas.  Eventually, somehow the idea popped into my head to build a robot that could climb trees.  At first I dismissed the idea as beyond my skill level, but after further thought, and some time in Sketchup, I decided to take a shot at the challenge.

Fully explained on [Instructables]