Before the whole "batterygate" thing[1], there were forums and discussions on macrumors and similar inquiring about the feasibility of inserting no-op codes deep below the kernel that would kick in under certain conditions. Post-batterygate, you can't find anything NOT about batterygate when searching.

1] Which I still firmly believe WAS indeed a power-supply design failure that would have forced a massive hardware recall had they not done something (slowing down the os). I believe it encompassed everything from inaccurate CPU power estimates to something actually incorrect with the PCB design, causing brown outs - and not merely a battery-aging red herring as is the reported scandalous reason they were "caught". In fact, I think Apple is GLAD that all it amounted to was some philosophical hullabaloo about protecting your poor aging battery.

To clarify, I suspect the "aging battery" merely exposed the real issue - the incorrect PS design - which Apple successfully covered up.