Manage your ideas like 37signals does.
A year ago, 37signals showed their internal app Iterations on their blog. Unfortunately today the application is still not available publicly.
I decided to change the situation :)
Assemble teams based on interest.
Your team can discuss each suggestion, can show their support or their interest in working on it.
Get updated by email.
Each time someone suggests an improvement, you will be notified by email.
Simple improvement workflow
Comment on the suggestions, show your support or start working on them.