His presentation at PAB2007 outlined his use of his podcast, Podictionary, as a vehicle to promote his book.
According to Charles, iTunes is king. Out of all the visibility he's received since launching his podcast -- something he did within 18 hours of getting the idea -- iTunes has reaped the greatest rewards.
Etymology's pretty interesting. Something I learned from Charles that weekend:
Thril = hole in old English. Nosthrils = nose holes