you can get splitters. Try your local Maplin store or there website, but be wary - they may only be 4 for a reason. Make sure that your PSU put's out enough wattage to support all your hardware.
And listen to connchri... Make sure your power supply can handle it. If you are using that 600 watter that you have in your signature, you should be fine. I have a power splitter on my 450 watt and it's doing fine... (6600 GT, 4 80mm case fans, 1 PCI exhaust blower fan, 2 CD drives, 2 HDD's... I think that's it )
http://www.sunbeamtech.com/
Its under accessories. It's called the minibay buss.
Click on where to buy at the top and your country and it shows you where to get it.
Those have been around for a while, but if you need more cables you should get a bigger power supply which have more cables. If you had too many splitters you may lack power.