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Two ideas, one already seen in the *nuke world.
AutoLinks
Simple enough, a core module which can link into any content (articles, forums, etc) that will replace a textual term with a auto-generated link. For example, replace the word 'ThisWord' with the code '(a href="CustomLink" title="CustomDescription")ThisWord(/a)'.
This could also be linked in with the weblinks area for things like clicking counting ...
AutoAcronym
Same as above, but to allow simple mouse-over hovers. For example, change 'WYSIWYG' with '(acronym title="What You See Is What You Get")WYSIWYG(/acronym)'.