This KishKish lie detector has been around since last August when the news popped up on Skype blog, but World Tribute is breaking it today and I'm following the cycle. The software plug-in works with Skype and analyzes stress levels in real time or in a voice recording. The makers claim that "Researchers found that frequencies in the human voice are sensitive to honesty. When a person is being honest the average sound in that range is generally in the lower frequencies, but is usually higher in dishonest situations."
Would be fun to run KishKish on telemarketers, or record and test soundtracks from ads.