If you want a simpler way to understand the power of tagging, I suggest John Udell's screencast. It's a really good description of how this stuff works.
GROOP.US is a web service to visualize your social context based on the tags you have used. It shows your areas of interests and relates people with similar interests to groups with shared tags and resources.
Freetag is designed for applications running on the LAMP (Linux, Apache, MySQL, PHP) stack. Theoretically, as long as you’re using MySQL and PHP, it should work. If it does, let me know!
Listal is a web based collection manager application which supports DVDs (region 1 and 2), books, games and music. The main features of listal are : Completely free to use Fast and simple user interface Organise your collection by tagging items wit