"Wikis aren't just great tools for sharing information and collaborating on projects. They also make excellent personal information managers. With a personal wiki, all of your to-do lists, notes, and appointments are at your fingertips in form that's easy to use and maintain.
"The problem with most wikis, such as MediaWiki (the engine that powers Wikipedia) is that they take a lot of effort to set up and maintain. You have to deal with not only the wiki software itself but also the Web server and database that underlie the wiki. All of that is overkill for anyone who wants a wiki for strictly personal use..."