[Jim]

Anyone looked into this?
Am thinking of it as a project for the lounge computer for silence but seems to be a lot of effort

http://russellware.com/liquidpc/

[GCW]

Hmm, half thought about it.  BUT, with decent air cooling I could (theoretically) overclock my q6600 to 3.7GHz.  Admittedly, I won't be going much over 3.0GHz.  Remember it's 95W. 
If you want a superfast processor and overclocked RAM to around 1000 and still keep it quiet, I can half see the point.  But for me it was too much extra hassle/ money/ effort to bother.
You upgrading, Jim?

[Jim]

I will be doing soonish, but this project won't be for the main pc

[Johnny Brown]

I wouldn't bother, you won't be able to hear it over the baby, and when its not wailing they love a bit of white noise. So I hear.