PCApex (who were PimpRig until yesterday) has just released a power consumption calculator, called Juice.  Just pick all of your components from the drop down menus and it calculates your total power needs, don't forget to specify the number of each component you have.  The only caveat is that this tool calculates total power consumption, it doesn't specify loads on each seperate rail.

"Fu3lman has released a new application which is an advanced PC wattage calculator for

determining the power usage of your system. (This is an expanded power calculator that goes

beyond what his previously released Overclockulator could do and is a totally rewritten

application.)"

Here are some more Systems articles from around the web:

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Systems

• Zalman ZM460-APS

Noiseless Power Supply Review @ MVKTech

TARGET="_blank">Zalman ZM460-APS @ Overclockers Online

TARGET="_blank">Thermaltake Toughpower 550W @ Rbmods

Antec Phantom 500W PSU @

Techgage

E-Power Silent Engine

550W Power Supply Review @ Legit Reviews