Key Light

This is the sort of thing that, once you have it, you wonder how you ever did without it.

From the website:
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Key Light

No more fumbling in the dark to unlock your door — just let our compact Key Light lead the way.

Durable polycarbonate case snaps onto any standard house key and includes a loop to attach to keychain.

Handy for use in the car, home, or anywhere you need a bit of portable light.

The built-in LED light shines a powerful beam exactly where you need it.
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$7.95 (key not included. I mean, come on — think about it).