I have a cheap 4x4 remote control toy monster truck. It was the result of a brainstorm when I was pulling several runs of Cat5 cable in a drop ceiling in a large office. Just tie the cable to the roll bar, stand on a ladder with my head above the grid ceiling and drive the truck to the desired location. It climbs right over lay-in fixtures and other cables. Once you get to where you're going, just move the ladder to retrieve the truck and fish the cable down the wall. The truck even has headlights!
I had a hard time convincing my kids it wasn't a toy!
