StoneNotes came about because of our frustration with existing personal wiki programs and knowledge management systems. Theyre bloated and hard to use. They never quite do what you want. StoneNotes is different: it has an intuitive and easy to use rich text editor, and a simple linking system. Drag & drop to organize your notes. Add custom fields to any note. Its simple. Its powerful and fast. It stays out of your way. More info »
It's pretty good - and I'd recommend it - but it's unstable, and the latest version is from before 2010, so it may be a dead project. Otherwise - it seems pretty decent.