I'm on the hunt for information regarding collaborative filtering. You know, systems like Amazon.com uses for recommending what you might like based on your activity and the likes and dislikes of others.
I'm especially interested in any open source implementations. A constant-time algorithm similar to Eigentaste would be a plus.
If you have any leads, information or insights to share, please do either by comment or e-mail.
- Alkindi, a Java-based collaborative filtering system that has been placed in the public domain. (Note: doesn't appear to be a complete implementation, but could serve as a foundation to build from.)