(Click image to enlarge)
I've just got a Lynxmotion - Pan and Tilt Kit from Phidgets (thanks to Microsoft!). The kit comes with two servos, a pan/tilt assembly, a Phidgets USB 4-Servo Controller, and lots of fun. :) The Phidgets controller connects to a USB port, and can control up to four servos simultaneously.
Here's a video - I'm controlling the pan/tilt of my webcam with a mouse:
I am really impressed by how easy it is to program and control the servos with the Phidgets controller. You don't need to have any knowledge of electronics or USB communication protocols for using it.
If you're interested in buying one , you can find it here - http://www.trossenrobotics.com/store/p/3137-Pan-and-Tilt-Kit.aspx