What is your most trusted gaming accessory?

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As the title states, What is your most trusted gaming accessory? Your controller, Wiimote or nunchuk? Perhaps your gaming keyboard or headset? Do you use a racing wheel or force feedback joystick? Maybe a memory card or hard drive for game saves? Anyone out there who can't live without a LAN card for online gaming? My go to gaming accessory is my Razer Copperhead laser gaming mouse. I play a lot of PC games and go get along without it.