I'm very soft launching the prototype of a program I've been working on for the last few months. It's basically a desktop application which acts very like this wiki. You can use it for quick note-taking, HyperText authoring.
It has a couple of cool features that this wiki has :
And a couple of things it doesn't
But note, it's very much a prototype / draft / UnfinishedProject which I'm shipping to get feedback. And it's written in VB so it's Windows only. It might not even work on your configuration, but I don't have a lot of machines to try it on. It works on the Windows 98 machines I have available, but I don't know where else. All bug reports gratefully received.
Oh, and it's GPLed, so if you have a copy of VB, you can get going on the source code.
If interested go over to http://www.nooranch.com/sdidesk/wiki/wiki.cgi for more details.
An ordinary page
But editing the pages uses WikiMarkup? like this
Including an image
A network diagram