topr8 - 11:38 pm on Oct 19, 2012 (gmt 0)

Glossaries are useful, both for user experience and in getting long tail traffic ... focus on user experience (within the site, eg i use the glossary to help users that are already on my site), forget about seo and it will start to bring traffic as a handy side effect - i agree that it depends on your niche and the focus of your site though.

historic note: back in the day there was a guy here, pretty sure his m=name was Woz who was a big advocate of glossaries and even had a directory of glossaries.