Excellent article on GUIDs.
http://blogs.msdn.com/oldnewthing/archive/2008/06/27/8659071.aspx
Posted in: Change Tracking
The GUID Guide
Posted on July 1, 2008
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Barry King 
Sam
July 19, 2008
And here a good little place to get them quickly:
http://createguid.com
Coolcoder
July 21, 2008
Or just.. SELECT NEWID()