Outline:

• Originally developed for an art site in 2005, to give visitors an incentive to contribute (add their art, vote on other people’s art, comment, ...etc.
• Open sourced with some features disabled initially, then talked the client allowing all features to be contributed, and they agreed
• Evolved into a user incentive, ranking and virtual currency system
• Got more than one requests to port it to Joomla
• Used on one site to encourage recycling, with online points and offline points, e.g. you take an item to a depot and they credit your account.
• Jacob Redding, Executive Director of the Drupal Association was the D6 maintainer, for work he did for a New York non profit.
• Contributed modules:
• Commerce integration (get points when purchasing, and use it as virtual currency too)
• Retroactive (accrue points for already published nodes and comments)
• Moderation
• Inviting users to join a site
• Voting
• Get a Role
• Services integration
• Karma
• Badges