Zalman is better known for their elaborate fan shaped heatsinks then anything else. Their heatsinks are always of the highest quality and even though they don't cater towards the overclocker enthusiast market, they still perform quite well.
Zalman's claim to fame has always been "noise prevention" and the Zalman 300W ST-300BLP is the quietest PSU we've ever used. In fact, it measures less than 25 dB loud so it is virtually silent in operation, and this has a lot to do with the fan and how slow it rotates.
FULL STORY @ PCSTATS (http://www.pcstats.com/articleview.cfm?articleID=1110)