I am interested in learning some basics in robotics for making small  
scale robots.  My first challenge here is to find out how to run as  
many servos as possible from an arduino or pololu controllers, in case  
I have money to build hexapods or humanoids in future.  All small  
factor controllers seem to be limited in number of motors that can  
control (2-12 servos), unless I use arduino mega (48 servos).

I have used daisy chained shift registers to control 32 LEDs using PWM  
from a regular Arduino.  As far as I understand, servos use PWM but  
within a certain range of frequency.  Can shift registers or LED PWM  
drivers be used for servos, or are there any specific ICs??

Thanks in advance.
Moto