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Something like this, http://www.thinkgeek.com/pcmods/cables/5e51/
Even though it says it's used for fans, I could theoretically use it for power supply too? (remember, nothing too big, just turn on, restart and fans)
All that does is control the SPEED of the connected fans by regulationg the amount of voltage to each. No on/off functionality whatsoever. Don't use something like this for anything else other than to control fan speed.