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My kitchen sink started leaking something awful a few weeks ago. And I only noticed because of the rust growing on the bottom of a can of paint undernearth the basin. My cabinetry is now warped—but could have been saved if I'd had a LeakFrog. This 3-inch by 3-inch toy detects water using two metal sensors on the bottom, and then beeps its head off until you notice. It supposedly runs for a year on three AAA batteries. The $12.99 investment is a bargain compared to what it will cost to replace my kitchen cabinet.

LeakFrog Water Alarm [The Gadgeteer]