Randy Sarafan has worked up a step-by step instruction manual for creating a basic robot capable of sensing and avoiding obstacles of its own accord. While basic, the platform allows for greater customization, including more complex logic and the addition of an array of sensors.
Sounds like a good time to us. You can click past the jump to check out a video of Sarafan's machine or head over to Instructables.com for the full briefing. If you get crazy with your own R/C collection, be sure to drop us a line and show us what you came up with.