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Tag data socially and auto-tag docs and files based on powerful rules
Use virtual folders and regular folders together
Manage multi-document projects, along with your colleagues on shared drives or in the Cloud
Works with files, folders and URLs (incl. tweets and gmails)
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Search your documents and files based on what they're related to
Access your data through different paths by combining categories
On-the-fly group projects' files far away from each other
Tag data socially and browse your office's tagcloud
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"...Tags and Groups Your Files with Virtual Folders" 
"...a new way to organize and find files" 
"...a bit-size taste of WinFS" 