Lee just posted a review of one of SilverStone's passively cooled Nightjar PSUs, the NJ450-SXL which grabbed a Gold Award for its performance and design.  If his tests somehow didn't convince you of just how impressive this tiny, fanless 450W PSU is then please head over to [H]ard|OCP as they just unstrapped this unit from the bed in their torture chamber.  Sure it is expensive for a 450W modular PSU but there is simply nothing else to compete with the quality of this Nightjar in silent, SFF builds.

"SilverStone is no stranger to small form factor PC power supplies as it is the most complete supplier of these to the enthusiast PC marketplace. Today SilverStone is adding complete silence to these SFF PSUs with the 450 watt Nightjar. Excellent efficiency makes silence easier, but can the Nightjar stand up to an extremely hot case?"

Here are some more Cases & Cooling reviews from around the web:

CASES & COOLING