Hacked Gadgets has a really cool CD-ROM bot made from old junk, in the video the little bot creeps across the wire nicely… Blake writes – “I contructed a simple robot about a year ago. It’s chasis is made from an old SCSI CD-ROM drive. It uses the mechanics of the drive to pull itself along a suspended wire. I built it for a project in my high school physics class. The objective of the project was to construct a device that would get from one end of a suspended wire to the other with no physical intervention. Our teacher gave a name for these devices. He calls them “Whizzers”. Mine does not really “whiz” but it gets the job done. – Link.