I've been playing around with TiddlyTagMindMap recently and I thought I'd give you a sneak peek of where it is as of now. There are still a few little bugs in it, but I've improved performance and added directional arrows. You will also notice you will now have to double click on a tiddler in the map to get it to display - something I've been considering for a while but wasn't too sure of whether to do or not (however dsjolie in the tiddlywiki google group confirmed it wasn't just me who thought this might be better.

The next thing on my radar is deleting of edges and pulling in rss feeds into the graph, however I have been working on a separate project with JayFresh which we shall be sharing soon.