Google Co-Op - Help other users find information more easily by creating “subscribed links” for your services and labeling webpages around the topics you know best.
http://www.google.com/coop

Google Trends - A way to see how often people are searching for certain terms on its site and where in the world those searches are popular.
http://www.google.com/trends

Google Notebook - Allows users to record information they have found on a series of Web pages and make that research public.
Coming next week!

- via NY Times

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