WP Idea Stream is a WordPress plugin to power idea management for your site. Your members will be able to easily create, share and rate ideas.
Here's a 3 mins demo of it (sorry for my english).
Available in french and english.
Before activating the plugin, make sure all the files of the plugin are located in /wp-content/plugins/wp-idea-stream folder.
To use WP Idea Stream with BuddyPress, you will need to download and activate the BP Idea Stream addon.