Using speech/text recognition, you can search past CAGcasts and Podzinger will take you right to the part of the show that contain your search results. It is far from perfect, but still very cool!
http://www.podzinger.com/results.jsp?scol=pod&il=en&s=PZSID_pod0_4_6_0005
http://www.podzinger.com/results.jsp?scol=pod&il=en&s=PZSID_pod0_4_6_0005