Hi,
I hate any kinds of fans so I've tried to build a passiv-cooled system.
The results are ok. I'm cooling my Athlon 1000@1200 and an IBM DTLA 307045 with water and the difference between water and air is only about 6°.
http://www.low-noise.de/web/artikel/passiv1
more pics:
http://www.opelscene.com/mods/cooler/gallery/
markus