TiddlyWiki:Because I have, apparently, been living under a rock for the past two years, I'd never heard of TiddlyWiki until recently. It's a stunning display of client-side Ajax power: a JavaScript-based wiki contained entirely in a single HTML file. No server-side logic required. Personal wiki wherever your laptop goes (regardless of network connection)? No problem. Wiki on a USB stick? Sure thing. Neat-o.
Tags: TiddlyWiki, wiki, Ajax