Delicious

http://delicious.com/

Delicious is a free, bookmarking web service for storing and sharing bookmarks. It works as a basic classification system because it allows users to tag articles, blogs, or websites under informal tags or broad topics.

It is important in many ways. First, it is useful as a search engine. Content is classified under tags/topics so those researching specific topics can be directed to new websites or articles through those tagged by others. Delicious is also a useful way to consolidate information from multiple people, locations or computers etc.

Delicious relates to mass collaboration and crowd sourcing in that the people who are bookmarking sites, are those who understand the topic content and care about the subject. They want to provide new and valid information to others.