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Yahoo is building a combination of social network, collaborative space and (most of all), lesson plan creator for educators called Yahoo Teachers.
The first part of the site is the "Gobbler" - a browser add-on that helps teachers save photos, text and sites from around the web in one place (see this video). Once Gobbled, users move to the second stage: organizing that information into lesson plans and worksheets, tagging them and sharing them with others to save time.