Oh, I wasn't reccomending using a wii remote, its a game controller, I just thought that would be a good example of a one excellerometer system if you had seen one. Though it actually uses a bit more than just the excellerometer, it has an IR sensor array that references a pair of IR LEDs which are about a foot apart, by comparing the distance it sees between them, their location, and their angle relative to eachother. It can detect its relative location to them, and its roll. But you probably dont want to work with stuff that advanced.
Anyway, what you do want to use still depends on the amound of precision you need, and how simple and cheap it has to be. For high precision I would still recomend mechanical sensors (potentiometers) rigged to a thing that is worn on the person's arm. Besides precision, this offeres the advantage that its output will be compatible with a radio control set without any conversion, though you might need to add something simple for calibration.
But if you want something mechanically simple and high tech looking, although it will only roughly follow the motions of the person controlling it, the accelerometer may work. But for that you will need to program a microcontroller to interperet the accelerometer, and setup some kind of wireless transmission method, as well as a reciever that could interperet the signals and put out the apropriate PWM signal for the servos. This could be simplified using microcontrollers with built in RF units, but it would still be a tall order. You would need to understand pic programming well enough to do multitasked pwm to run the servos, some fairly intuitive AI to interperet the accelerometer, A/D conversion (depending on the output of your sensor, but this is an easy part), and set up the encoding, transmission, reception and decoding of the data.
Personally I'd take the first approach, mechanically more complicated but electronically simple, but then I'm a Mechanical Engineering Student, not a Software or Electrical Engineer.