We stock now 6 types of Analog Servo drive motors https://www.olimex.com/Products/RobotParts/ServoMotors/
The motor parameters are encoded in their names:
MS-1.3-9 means – Servo-Motor with 1.3 kg.cm force and 9 gram weight.
MS-R-1.3-9 means Servo-Motor with 360 degree angle and 1.3 kg.cm force and 9 gram weight.
All servo motors came with various exchangable plastic arms:
Separately are available aluminum ARMs which can snap to the bigger 3.2 kg.cm and 6 kg.cm motors, these are so powerful than can open and close drawers.
Adruino have special library for servo drive just notice that the normal servos will accept angle between 0 and 120 degree only, while the R type will accept from 0 to 360 degree.
The demo code is on GitHub: https://github.com/OLIMEX/DUINO/tree/master/AVR/SERVO
You can see the code running on this video http://www.youtube.com/watch?v=OdH7dr4Aa30