Wikis are common tools in the web worker’s arsenal; storing and editing stuff on the web comes naturally to us. But many wikis these days are large and complex animals, with a host of editing tools and relatively cluttered user interfaces. If you’re looking for something simpler and more portable, take a look at PicoWiki.
With PicoWiki, the idea of wiki-as-a-notepad is stripped down to its essentials: adding, editing, and browsing pages, and searching for text. You use standard Markdown syntax to create HTML, and everything else (even history) is thrown overboard. This makes PicoWiki ideal even for constrained devices like your BlackBerry or iPhone. Registering and hosting your own wiki on PicoWiki is free, though donations are appreciated.