I would be very suprised if peripherals could be damaged by overclocking the FSB. I certainly could be wrong but I just don't see how. Most of the problems from overclocking are due to data and/or clock signal degradation, timing problems, or heat (northbridge and cpu typically are the first to be effected by heat). Of those, only heat could damage a component. Long term damage to logic circuits from overclocking is very possible but in most cases even the shortened life span still far exceeds the normal amount of time the device would be used before becoming obsolete. I suppose very low quality components could be suseptible but most manufacturers do fairly exstensive quality assurance testing during product development by running clock and voltage margins, and exposing components to environmental tests (hot boxes). I'm sure most manufacturers also pull random samples off the assembly line for quality assurance testing.
I would also think that you would have system instability long before actual physical damage could be done to a component from overclocking. Most of the cases of people having failures that seem to be related to overclocking could just be a matter of a weak component being exposed by the faster clock and harsher environment. Those same components might very well have failed under "normal" conditions.
Just my opinion...please feel free to shoot holes in my theory