"But what on Earth is a TiddlyWiki?" I hear you ask.
Actually, it's kind of hard to describe. Well you've heard of Wikipedia? Imagine a personal version of Wikipedia that contains all your personal content of "whatever" in one easy to use system. Better yet, imagine a system where you don't actually need to use any software other than a web browser. To best describe it, in it's own words it is "a unique non-linear notebook for capturing, organising and sharing complex information."
At it's core each component of content is broken down into "Tiddlers". Essentially a text space with a title (and optional tags) which you can then cross link to other content. As such you can build up a complete web page for whatever kind of content you choose. But one of the best features of this system is that it is just an html file (with a lot of JavaScript that handles the core functionality. You can keep it on your personal file system, or because it is a web page, you can host on a web server, or better yet, via DropBox or other cloud services.
I am current at the TiddlyWiki European Meetup where we are working on the next versions of the core systems.
You can find your own personal TiddlyWiki at http;//tiddlywiki.com