I've started some small work on a bot for this challenge. I'm not sure how it will look in the end, but I certainly need to rethink the base, since it's a bit front heavy now, if it reverses to rapidly or goes over an obstacle the front mounted SRF02-sensor will think "neat! an obstacle within 24 centimeters!" and make the robot turn, which is not so good. Pictures of the design so far. The code is quite boring at the monent, so no post with that (yet).