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i'd vote chopsticks as all-around most useful.

i like 'em cuz they're used one-handed and held only in one position/direction (think of the twisting and rotation of the wrist involved with the use of a fork, not to mention grip/position changes for different actions like stabbing and scooping).

can be used to pick up items of various shapes and sizes, a) without piercing them and b) using variable amounts of pressure.

shape and size make them useful for cooking and prying (eating shellfish).

i dunno. who needs a knife? just pick up that whole steak and bite the damn thing. eat soup like a chinese person - use chopsticks to pick out the large chunks, then tip the bowl back and slurp.