Dave Ramsey has a must read blog if you are at all remotely interested in jazz. He's got a wonderful post about the art of the held note. Harry Carney is the example in the youtube video. Wonderful stuff as always.
http://www.artsjournal.com/rifftides/2009/10/weekend_extra_the_art_of_the_h.html
http://www.artsjournal.com/rifftides/2009/10/weekend_extra_the_art_of_the_h.html