A recurring theme of postings on customer involvement methods is that traditional market research methods such as focus groups and brainstorming kill ideas and creativity; there is a need for better ideation techniques that truly engage users.
J. Scott Armstrong has suggested using Delphi techniques to access the wisdom of crowds without suffering from idea truncation common to group efforts. Some researchers have suggested online groups to loosen the group effect.
Another blog takes a look at the benefits and dangers of using online communities in new service development:
ProfessorGary on Innovation and Marketing 
Great find, thanks Gary. I’ve added a link on my blog:
http://www.choosenick.com/?action=view&url=co-creation-traps
It reminded me of a post I wrote the day before that you might find interesting:
http://www.choosenick.com/?action=view&url=the-trend-towards-gathering-rich-realtime-feedback-aka-having-a-conversation-and-where-it-might-go-next