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Seems mighty promising. Imagine searching a recorded files of a seminar, or the taped record of customer service reps. It currently works only in .wav files, but that's just a matter of time. And the price tag is rather hearty (5 figures) but that's also a matter of time.
Why not sound? I can see myself purchasing a "secure" telephone in the near future. :)
Imagine being able to search for specific Mick Jagger lyrics! On second thought, that might be a bit beyond what any software can decipher.