I've never actually used bubbl.us
; it's a free online web tool for brainstorming. I think it's a really great site, though, and I had it bookmarked. From the book I'm reading 'Research Your Family History: Genealogy for the first time.' By Laura Best, on page 34, she provides a 'Concept Chart' which is basically a brainstorming sheet for an ancestor. I did a brief google search but couldn't find any Concept Charts online, but I wanted to point everyone to bubbl.us and I did a mock up as an example [not the complete information, obviously, but you can probably check out the book at a local library].
Bubbl.us is super easy to use, clean interface, and you can export your brainstorm image as an image, xml, and html. I think it's a good way [when you think you've exhausted all resources] to 'see' what you've got about a person when you've 'finished' with them. I use binders with information for each person, so I can see myself printing these out and using them as the 'front page' for each person. For me it'll be a good way to see who I still need to 'finish'.