You can purchase quite inexpensive Fan controller units which are used to alter the speed of up to 8 fans. They can be obtained to fit a 3.5" or 5.25" drive bay, use one molex connector for all fans, and are the best choice to use.
You'll have to find a vendor near where you live, of course, but here's an example from my own local vendor:
http://www.pccasegear.com.au/prod647.htm
If at all possible, avoid running case fans off motherboard connectors, because the power in your motherboard is best left for vid card, RAM etc.
I concur.
Not only should you avoid running case fans off of the motherboard connectors because you need that power for the CPU, RAM, and vid card, etc, but some higher power fans draw more current than you should be pushing across your motherboard. Personally, I like fans like the Vantec Tornado. Granted, it's loud as a hair dryer, but it's got a 4-pin molex connector for power, but it's got the 3-pin header so you can still use the motherboard header for fan speed monitoring.
One of my favorite stores for PC cooling stuff is
http://www.sidewindercomputers.com . They have pretty decent prices, and all of the stuff I've bought from them (rounded cables, thumbscrews, fans, fan guards) have been great. I'm thinking of eventually picking up some Artic Silver from them soon, as I'm going to be building a new box eventually, and I plan to redo the thermal paste on my current CPU as well. I just don't feel right using el-cheapo thermal goop on my Barton 2500 with a Swiftech MCX-462V...
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