If this page could be updated with a helpful hint to use an external power source, not USB power, when experimenting with Servos, it could save much frustration for newbies (like me).
Thanks for the consideration and all the work already put into the forums and website.
Note that servos draw considerable power, so if you need to drive more than one or two, you'll probably need to power them from a separate supply (i.e. not the +5V pin on your Arduino).
"Additionally, servos can create over current conditions which will cause feedback on the USB circuit, producing unpredictable results even with a single servo attached."