User case: For example, you could write a book using TikiWiki. Writing book is hard and boring (when it is not exciting ), so you need constant motivation. A script could be runnung as cron job, that every night grabs a set of pages from a TikiWiki sturcture, calculates this day word count, and compares with yesterdays word count. Then it sends you an email: You moron, you wrote only 150 words yesterday!
Also, I'm pretty sure many people would find a lots of usefullness in a programmatic access to the contents of Tiki's wiki pages, blogs, forums - not only trackers that already put form contents into the database. It would be nice to have wiki contents exposed as, say REST web service through URLs like this: