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"reBoxed sorts unread emails in your Gmail Inbox by the importance of the sender. You start by voting on pairs of contacts – "whose emails are more important?". Your votes are then combined with your friends' votes. reBoxed's algorithm then sorts your inbox based on this input."
Would be unthinkable under EU laws…
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Inventory of bookmark popularity lists (à la Digg Frontpage or Del.icio.us popular)
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"web application that organizes information chronologically. Google News Timeline allows users to view news, scanned newspapers and magazines, blog posts, sports scores, and more on a zoomable, graphical timeline."
The search box is very powerful, but you first need to pick a category from the drop-down. Google lets you add different sources: blogs, newspapers and it shows structured information from Wikipedia and Freebase."
See paintings example at http://googlesystem.blogspot.com/2009/04/google-news-timeline_20.html