A keychain flashlight can be a useful addition to your keyring - I've most often used mine to seek for the remote under the sofa or for change behind the dresser when laundry day comes around. (If only they'd invent one that would light up on impact, keys dropped in the dark would be a much less harrowing experience.) eGear's LED Latern Keychain is just like a keychain flashlight, only it's shaped like a lantern. It's an aesthetic thing.
The 2" eGear LED Lantern is activated by twisting the base, can display either a constant or blinking light, is water resistant, and has a battery life of 25 hours. You can get one from ThinkGeek for about $10.
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Cool!led keychain