Here's my two cents . . .
The Ringwraiths still wielded the Nine Rings that Sauron gave them. These rings corrupted and enslaved them, but the rings gave them certain powers. These were magic Rings of Power, after all.
Perhaps their ability to sense the presence of the ring was one of the powers bestowed by the nine rings of mortal man. Another power, now that I'm thinking about it, was the ability to force the ringbearer to don the One Ring and reveal himself to them.
What d'ya think? [img]smilies/rolleyes.gif[/img]
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