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This is an interesting script. I have not installed it or tried it, just browsed through the instructions.

Things that caught my eye:

There is no mention of mySQL or any database needed.  I like that.  Flat files can be good.  All you seem to need is PHP.

You can install this on your home computer if you want a truly private wiki.  Or you can install on web server.

Has a plugin type system so you can extend it.

If you add the calendar plugin you get one page per day.  You could do a diary or daily journal with that.

Seems to be a very high powered wiki.