Interesting read, from both positive and negative viewpoints -
1. Use brainstorming to combine and extend ideas, not just to harvest ideas.
2. Don't bother if people live in fear.
3. Do individual brainstorming before and after group sessions.
4. Brainstorming sessions are worthless unless they are woven with other work practices.
5. Brainstorming requires skill and experience both to do and, especially, to facilitate.
6. A good brainstorming session is competitive—in the right way.
7. Use brainstorming sessions for more than just generating good ideas.
8. Follow the rules, or don't call it a brainstorm.
Read more here - http://www.businessweek.com/
"8. Follow the rules, or don't call it a brainstorm."
- Eight Tips for Better Brainstorming (view on Google Sidewiki)