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 :)