RE: Radio controlled servo?
If what Rafael said is correct, here's one way to do what your asking:
[link=http://www.pololu.com/catalog/product/207]Serial Servo Controller[/link]
This can control up to 8 servos via a serial port on a computer.
Now you need wireless serial comms (a little easier to find).
The easiest way that I know how is this:
[link=http://www.sparkfun.com/commerce/product_info.php?products_id=8687]XBee USB[/link]
(or the Xbee Dongle, if you don't want to deal with a cable). This plugs into your computer
You'll need two [link=http://www.sparkfun.com/commerce/product_info.php?products_id=8664]XBee TX[/link]
(depending on what range you want will depend on which one to buy).
One plugs into the above USB board, the second is the serial interface to the Serial Servo Controller.
This will, basically, get you wireless serial control of 8 servos. I can go into more detail if this sounds like what you are looking for.
-Dave