On Ubuntu 12.04 Unity, I was missing an indicator that could show me the current frequency of all 4 my CPU cores, so I wrote this minimal sample in Python to do just that.
It uses PyGObject, and simply parses out /proc/cpuinfo every few seconds to extract the current frequencies of ALL your CPU cores. These frequencies are then shown in a label in the indicator area.
It looks like this:
I'm making this available under the BSD license just in case someone else needs a minimal sample to get started with, or an indicator to show the CPU frequency (but that would be weird).
-- Charl P. Botha http://charlbotha.com/