The first method, with the custom desk and all, is way more work than I'm willing to put into it.
The mineral oil method of cooling is nothing new and it does work as long as you can keep the oil cool. It would be a bit of a mess when you decide it's time for a new video card, power supply, RAM, etc.
I think I'll stick with traditional air cooling, at least for now. No, I can't overclock my Core2Quad to 6 GHz, but air cooling is simple and I like the simple things in life. :mixedsmi: