Tim Berners-Lee has called for a linking together of all data. He had a
compelling presentation at TED in 2009 (http://www.ted.com/index.php/talks/tim_berners_lee_on_the_next_web.html).
Linked data is also finding its way onto the personal computer. The ideas behind the Semantic Desktop is to link emails, instant messages, tasks, meetings and documents with contact information making it possible to follow a conversation across all media. The NEPOMUK project, funded by the European Union, is one example. Another is Xobni, which is a commercial product for your MS-Outlook inbox that does much of the same.
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