In the lead-up to this year's Autonomous Vehicle Competition, Sparkfun just posted the stats for last year's AVC:
Last year we asked participants to give us a list of the major parts they used in their vehicle (SparkFun or otherwise) and 31 participants responded. And similar to the whole field, about two thirds participated in the ground competition and one third aerial.
The controller most often used in ground vehicles was an ArduPilot (ArduPilot Mega 2.5) (30%). The ArduPilot is an assembled PCB with an accelerometer, gyroscope, magnetic sensor, pressure sensor, GPS connector and current sensor. [Using the ArduRover code]
This year 3DR is going be debuting a new ready-to-roll ArduRover at the AVC, which is designed to dominate again ;-). Sparkfun is now giving away five of these (Developer Edition) free to AVC entrants! See the details at the bottom of the post here.