Downloads: hotlinks.php, hotlinks.backup.
This plugin adds a site.hotlinks? page to your site and will cause all text listed on that page to become an active link (subtle, dotted underline, with mouseover--notice the word: plugin). Click on the link and it goes to a glossary page or the page of your choice (as defined on site.hotlinks.
It's used on this site in the documentation section but it could be used in various creative ways. The backup also includes a default glossary page for BoltWire, at main.glossary?.
Note: you can now add anchors to your glossary page to have the link go to the exact section of the page with the term you wish. The anchor must use the same name as the hotlink term.
As this plugin sometimes conflicts with other markups, I just released an update to the plugin that processes things later, and only on terms in the main zone. This should cut down on conflicts.