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Plum, of San Francisco, is a start-up that launched yesterday at DEMO. It wants to let you easily collect all URLs, emails, photos, documents, on a particular topic and save them as an easy-to-access collection — and then let you share it all with others. At least it is focused. It is in private testing, but you can sign up at the site.

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Update: And Kaboodle, of Santa Clara, is being featured at DEMO too, and has a similar collection technology, but is more geared toward online shopping. We have to agree with Om, though, who first blogged about this back in October: The biggest fear I have is that it can be easily imitated by the big three – Yahoo, Google and MSN.