I think the term "glass chin" is being thrown around too much nowadays. Every time a guy gets KO, he gets thrown into the glass chin factory. I think sometimes a weak chin has been confused with a weak defence or a single defensive error. The question is: which boxers have good chins?
Shane Mosley has a damn good chin. He's only been down once officially - but went down twice in that Forrest fight. It's the only time he's been down professionally and he took some clean shots from some good competition.
Oscar De La Hoya Shane Mosley Antonio Margarito Manny Pacquiao Joe Calzaghe Ricky Hatton Wayne McCllough Bernard Hopkins To name a few..