Would you like to have your own wiki in your PC so that you
can keep your own diary. ? Why not if it is free.
Just start the apache with php suppot and explode the dokuwiki into it
I have set up a dokuwiki in my laptop for my diary need. You do not need
the RDBMS database for this. Its available at http://wiki.splitbrain.org/wiki:dokuwiki
Another promising wiki is Prowiki http://sourceforge.net/projects/prowiki/
There are also now sofware which can become wiki on desktop read for more