In an effort to encourage people to put their rubbish in the bin, instructables user "kgrevendonck" has created a fun device similar to that which tracks basketball goals. They've fitted an Arduino with an ultrasonic distance sensor and an LCD. Then every time something flies past the sensor and into the bin, the score accumulates. They've also taken the project one step further in the video below, by using a PC running processing to generate a nicer score display (note that some of the video is in Dutch, but you'll get the idea):
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