I actually found that article quite entertaining, it's a breath of fresh air in here compared to the normal "Overclock everything that has a clock" that I see in these forums everyday.
Overclocking is usually down to the best parts and lots of money, plus some skill in the art, with a bit of luck, to produce a stable megaly overclocked box.
Underclocking has a bit of an appeal to me, because it's something one could piss around with old delapitated computers, that have past their day, the aim to underclock them the lowest before you cannot run Windows XP. Basically something that you do for shits & giggles :P
And for those overclockers who are probably gonna jump on me and flame me, do something challenging for a change, go overclock your oven, microwave or TV...