www.silentpcreview.com/article699-page1.html
Heh, my new PSU (Seasonic S12 Energy+ 550/650) is the highest-rated PSU with fan listed on that page... Only the fanless ones are quieter (and also significantly less powerful).
(It is indeed very quiet, and rock solid. Tons of connectors, too. I'd buy it again in a heartbeat, the only downside I've seen is that the cabling isn't modular)