I really do like the TiddlyWiki Jeremy Ruston introduced at the conference yesterday - it's kind of a personal notebook and it "allows anyone to create personal SelfContained hypertext documents that can be posted to a WebServer, sent by email or kept on a USB thumb drive to make a WikiOnAStick." Great for teaching and e-learning purposes, I suppose.
But what is meant by tiddly? The possibility of jumping around? Or even one of the other meanings of that word?