Many people out there have undoubtedly found themselves in a situation where they need to plug another computer component into their power supply but have run out of plugs. You think to yourself "jeez, I need more plugs!" Well, here is the solution.
Using parts from an old power supply and a case fan, I've built a Molex Y-splitter. I've seen these retail for around $4 (more if you take shipping into consideration). The parts I used were leftovers - total cost of $0.00.
Just a friendly reminder: Always know the proper use of any of your equipment - read any manuals and take all safety precautions. Safety glasses are recommended in just about any endeavor including tools, so if you think you need them, WEAR THEM. I am not responsible if you hurt yourself attempting this mod and I hope you don't. I managed not to burn myself with the soldering iron this time, so go me!
Leftover (male) power plugs from old power supply
Female molex plug (mine was from a case fan)
heatshrink (or electrical tape, if you don't have it)
Incredibly tiny flathead screwdriver (like the kind you find in a eyeglasses repair kit)