Walter Feigenson
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123people
123people is a people search engine that looks into nearly every corner of the Web to help you find information on everyone you (want to) know.
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Dropbox
Changing the way people think about storing and sharing their files. Y Combinator funding in summer 2007.
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Posterous
The dead simple way to blog using email.
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Socialbrowse
Socialbrowse is a free Firefox extension that lets you easily share and discuss links in real time, and see what's good on every page.