Not only is this one of the cooler pieces of software I’ve seen in a while, but the name makes me giggle to no end.
From the TiddlyWiki site:
A TiddlyWiki is like a blog because it’s divided up into neat little chunks, but it encourages you to read it by hyperlinking rather than sequentially: if you like, a non-linear blog analogue that binds the individual microcontent items into a cohesive whole. I think that TiddlyWiki represents a novel medium for writing, and will promote it’s own distinctive WritingStyle. This is the ThirdVersion of TiddlyWiki, which adds several NewFeatures. There are also several TiddlyWikiAdaptations by other developers based on earlier versions.