Joysticks and Controllers
Computer gaming is not all just about keyboards and mice. There are some very detailed flight and driving simulators that are not just games, but training programs. If you are shopping for a gamer who digs aerial combat or racing games, here are some highly recommend options. There's also some basic game controllers you can get that work very much like the ones you'll find on a console system like the PS3 or Xbox 360.
Logitech Extreme 3D - This is currently the best selling joystick on Amazon because it's from a solid company and the price is only $25. Just make sure the gamer you buy this for does actually play flight sims, otherwise they won't have much use for it.
Logitech G13 Programmable Gameboard - While it may be odd looking, this is quite an impressive gaming device for 58 bucks. It's like a miniature keyboard designed just with the keys most often used while gaming, plus it features backlighting, programmable keys and more. The ergonomic design is perfect for long gaming sessions.
Classic NES USB Controller - If the gamer on your holiday shopping list likes playing old Nintendo games using an emulator, then they will be absolutely thrilled to have this retro styled gamepad. It looks exactly like the original NES controller and connects via USB. Any person who grew up in the 80's would love to have this, and it's only $11 at Amazon.com.
Logitech G27 Racing Wheel - For the hardcore racing game fan in your family, you could really show the love by dropping $250 on this racing wheel and pedal set. It features motorized feedback for maximum realism, a leather wrapped steering wheel, and more. You can even buy a special chair to mount all this stuff so it's just like sitting in a driving simulator.