I'd be interested in tools helping to organize thoughts and ideas, especially in a non-linear way (i.e. not as most existing note taking tools, working with lists and bullets, but rather as a post-it application). Ideally, something like the tool they use in Minority Reports would be cool (without the fancy-touch thingy), but an important point would be the ability to visually connect different ideas/notes together.
EDIT: Maybe to make things more explicit, I have a visual memory, and it helps me a lot having a graphical disposition to classify things (like important things at the top-right, urgent ones on the middle-left, etc). Basically, I'd like to find my messy desk on my screen :)
TiddlyMap.org - I just found it after looking at your question... Searching through another site.
It works with TiddlyWiki - the recently developed version.
TiddlyMap will let you make a clickable graph of your wiki tiddlers, and show you real time navigation as well of where you are in your graph.
DenkWerkZeug - http://denkwerkzeug.com is an application I have been looking at for a while and learning about. It combines a Wiki with a graph and semantic principles, but is not difficult to learn, a fascinating application.
And one more named Vis-a-Wiki, that I have heard about that combines a visual approach with wiki and graph as well as Scrumban board... Vis-a-Wiki has 'context sensitive navigation'.
I include these together not take away from, but hope as to just let people know about the existence of these independent software projects.
Hope this helps... -jariell