Pololu - Introduction to servos
Hobby servos are small, modular actuators developed by the radio control (RC) hobby industry for remote manipulation of everything from miniature boat rudders and car steering linkages to model airplane flaps and toy parachutist release mechanisms. The RC market is large and competitive, which has led to a proliferation of servos that have been optimized for characteristics including size, speed, torque, and price. This modularity, variety, ubiquity and cost-effectiveness of servos make them attractive generic actuators for small robots and other electromechanical systems.
Servo Motor With Raspberry Pi and Maestro board
Pololu - Micro Maestro 6-Channel USB Servo Controller (Assembled)
Micro Maestro 6-channel USB servo controller bottom view [10
Pololu - Sub-Micro Servo 3.7g
Pololu - Power HD High-Speed Digital Servo DS120M
Pololu Maestro Servo Controller User's Guide
Pololu - Power HD High-Torque, High-Voltage Digital Servo 1218TH
Pololu - GWS S689-2BB/MG/JR Giant Servo
Pololu - Gettin' all up in your servos
Pololu - Power HD Continuous Rotation Servo AR-3606HB
Pololu - Goteck Mini High-Speed Digital Servo GS-D9257
Pololu - Introduction to servos
Getting Started with the Pololu Maestro Servo Controller
Remove a Servo Controller : 5 Steps (with Pictures) - Instructables