yeah I heard about it a long time ago too.. Always found the idea interesting.
I'm running my CPU overclocked right now actually, using nothing but the stock HSF unit and crappy thermal pad that came with it. 1.8 - > 2.2ghz
Would probably be a little higher if I had my watercooling gear hooked up.. Before I ran into money problems I was all set to buy some new parts. A new Intel Core 2 Duo, was gonna get it hopefully up to around 3.5 - 3.7ghz from 2.4ghz..
Now the price of the chip is jacked way the hell up to $222. Just the chip, no motherboard, no ram... #1 reason I hate Intel, but they have the fastest shit right now. That chip was around $180 when I was looking to purchase it a couple weeks ago