MOEmentum has a section on brainstorming - link below. And if you want to get even more detailed, there is an old presentation on MOE's website on project management, based on standard procedures used in corporations.
If you are a rookie or near rookie, you should check out MOEmentum, a weekly guide to the build season. I may be a little biased, but we get a lot of feedback from teams that have found it very useful.
Another good source for brainstorming help is the WPI Thinktank - link also below
http://moe365.org/moementum/moementum1.php
http://moe365.org/moeu/moeu2003projectmanagement.pdf
http://thinktank.wpi.edu/Portal