Staves
My feeling is that wizard's staves, much like the rings, amplified the power of the user. Most enchanted items, such as blades, boats, jewels that give off light, balls that let one see far away and cloaks that make one harder to see, each had specific functions. The staves and rings seemed much more general purpose tools.
Thus, I would think breaking Saruman's staff was a blow to his power, but it would be hard to point at this specific ability or that and say what was lost.
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