If you're lucky enough to have an Xbox 360, Wii, PS3 and PS2 or any combination of those, this XCM XFPS 360 multicomponent cable v2 can hook you up. Just flip a switch and you can toggle between all of your machines, you spoiled brat. Your next assignment: play games on all four machines at the same time.
If you're rich enough to have all those consoles, this cable's $29.99 price won't bother you. Looks like the thing actually works, too—check out the video, if you can stand its elevator music:
Product Page [XCM]
Buy it here [Total Console]
DISCUSSION
for roughly the same price you can get a component video switch box from Radio Shack. The bits inside are bound to be more robust than a mincy little switch. Plus, though it's another device to have to find a home for, it's not a cable sticking out of the back of the entertainment center. The idea for this is sort of a contradiction... it streamlines your cable run and you only need to take up 1 input for 3 devices, but you still have to get up and reach around the back to switch between them. If you're going to spend that much effort you might as well just swap the plugs each time.