Beta 1 of the WinFS SDK is out and available to MSDN Subscribers. Get the bits and the docs, and see how to take advantage of Microsoft’s next-generation relational file system for Windows. Few useful WinFS links
http://www.msdn.microsoft.com/data/ - Home
http://blogs.msdn.com/WinFS/default.aspx - WinFS Team Blog
http://msdn.microsoft.com/newsgroups/default.aspx?dg=microsoft.public.windows.developer.winfx.winfs&lang=en&cr=US - WinFS Newsgroup
http://channel9.msdn.com/showpost.aspx?postid=106356 - Check out videos of WinFS in Channel 9