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			Just want to put in my 2 cents. Even if he could have torn himself away from Barad-dur long enouph and wanted to find Frodo, Frodo and co were pretty carful about keeping themselves hiddin.  If Sauron didn't notice them, how would Aragorn have found them?  I think that this palantir could look at other places other then a person they were talking to but Frodo is small and Aragorn had no idea of where to look first.
		 
				__________________"Wake up! Wake up! Wake up, sleepies, we must go, yes, we must go at once."
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