Tom's Hardware have thrown up a new article which looks at liquid nitrogen cooling for your Intel P4 CPU!

Just how much cooling can the P4 withstand for maximum overclocking? We cranked the CPU down to -196°C with liquid nitrogen and, with compression cooling for the chipset, we managed to clock the processor at 5.25 GHz. For those of you with any doubts, it's all on the 11th THG video.