Gunnar Sommestad has built a wonderfull machine, go and see: http://www.literarymachine.com/ (LM). This tool is given for writers. But I beleive it can be really good for creativity technics support. It doesn't work under vista, but works with XP. It's shareware, not that expensive (50€) and the quality is ok (even if it is not bug free)...

It supports with no pain Morphological Analysis thanks to the table feature and also the Brainstorming Sessions with the Items (ideas), Concept (ideas classification) and even Selection thanks to the project feature (the selection process is not supported, but the project.

Too bad it seems Gunnar seems not working on a new version of his software: it could be a "Killer App" to support creativity sessions!

Compared to mindmaping, it's more respectfull of the Brainstorm 4 principle's. It may be used after a session hold for example with a chat system, and work on the chat capture

- The creativity  part is done through chat
- The organization and classification with the literary machine
- And the selection reporting as well

LM can also be used as the capturing tool, even if I find less covinient and looking as a bootleneck to have only one scribe: he can be overwhelmed... However, it will make easier the classification phase (else, if you use the chat session (with a tool like MSN or IAM with chat capture enabled) you need to considere to have a break between the creativity and the classification session to have time to capture the chat session with LM... A point to work-out!).