Jon over at Motherboards.org has posted an article that'll tell you everything you need to know about those little boxes that give your system juice. Strangely enough, I got a DOA Tt PSU from Newegg yesterday. Suppose there's a first time for everything...

"Watts, amps, volts, rails, PFC, efficiency; there's a lot of buzzwords flying around there and hardly anyone seems to know what they all mean. Well, now's your chance to finally become a power supply guru. I am going to try to explain it all to you. Hopefully, in the end, your brain will not be a buzz of over-information."