Re: Fan Control Question
There are things called fanbuses that will do this for you as well. There's a lot of great fanbus controllers out there, and while it's nice being able to control them on the motherboard, I find that having a fine grained control over them on the chassis itself is great when I need that extra blast of air, or want to quiet a PC down in the middle of the night.
Do you have a preference? Do you want them all to be on the motherboard? There's nothing wrong with that, and when you run out of spaces, you can, as you asked, put them directly on to the power supply, but the main drawback to this is that unless the fan has a PWM module (air temperature sensor) or an in-line fan speed switch, it'll run at full speed for whatever voltage it is being supplied, so you lose that fine grained control.
That's fine for lower speed or low noise fans, but sometimes you need a high CFM fan to get the case to the temp or airflow that you want, so plan ahead when possible.
If you'd like to see some fanbus modules, I can dig some up and post, as I'm sure others will as well if you're interested. One of the benefits to a fanbus is that it only requires one connector to your power supply, but can have up to 8 connections (so I've seen) for you to attach fans that it will both monitor and control.