Robot Combat

With the welcome return of Robot Wars and apparently no thread on the subject here, now seems as good a time as any to start a discussion thread on the topic of robot combat. Slight overlap with science and technology, but if there is a problem it can be moved.
This thread is for discussions concerning the sport and hobby of robot combat, competitions both televised (such as Robot Wars and Battlebots) and non-televised, competitors, and other similar roboteering subjects.
Edit: Really enjoyed the final tonight.