I've been using TiddlyWiki for some years as a personal wiki space and although the first version was a bit clumsy about saving and searching ; today, it is the most re-usable, portable, easily shared self-contained wiki that you can find to manage your local tasks and information.
Mainly, I use TiddlyWiki to maintain notes, store and manage links. While there are online sites like Delicious and Stumbleupon which facilitate users sharing weblinks, they dont have the highly customizable features that Tiddlywiki has ; namely, the freedom to customize, edit pages and add oodles of content (ex. store phone nos, or other personal data which you dont want to store on a public space). Sometimes, I want to add IRC conversation snippets or installation notes as a future reference for something I had tried previously and found useful and it makes it very easy to add new tiddlers instantly. This level of fine-grained user-level customization is not available in any online site.
I wanted to share this so that folks who like wikis for the ease of editing can use Tiddlywiki instead of struggling to maintain local wiki installations on their servers. Dont forget that Tiddlywiki is the only wiki that does not need a server-side implementation and runs entirely on your browser.