The glossary module has been updated to allow multiple thumbnail images per term to be displayed, and for the thumbnails to link to colorboxes. I'm still working on getting the colorboxes to display additional metadata such as the description and keywords. I've also have to go through the terms one by one and make sure the attached illustrations are the right ones and check for missing ones. Eventually I would like to build a different glossary module that treats each term as a node and allows users to both comment and rate each term. In the meantime it is just nice to have the illustrations working properly.