Hack together a local ikiwiki w/o a web server using w3m's cgi-less mode and $EDITOR. Browse around a wiki, select pages to edit and get dropped right into the editor and have the page committed to svn automatically.
Less grandiosely, a simple command line util to add a new page would be useful, especially if it made it easy to add blog entries to the wiki. I have a special purpose version of this in my blog script.