Just a note to say that I have edited the Wikipedia article on T-glottalization in order to improve the presentation of examples. I'm not really happy about the beginning and end of the article: this is a topic that tends to attract a lot of unscientific speculation about the origins, frequency and distribution of glottalization. Still, I hope it's now better than it was.
A blog that discusses problems in Wikipedia's coverage of Phonetics
Emeritus Professor of Phonetics