From the website:
What is Brainstorm Anywhere?
A new way to collect and evaluate feedback from 100’s to 1000’s of people.
Brainstorm Anywhere is web based software the lets large groups brainstorm and evaluate ideas in real time. Feedback can be collected in live meetings or over time.
Brainstorm Anywhere is being developed by Denver, Colorado-based PlaceMatters.
Update: Brainstorm Anywhere has been discontinued. Existing information on the tool from its developer, Jason Lally, can be found here.