A blog by Jose Barreto, a member of the File Server team at Microsoft.
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Here are some notes on "SQL Server 2008 Indexing" I took while attending an advanced class taught by Kimberly Tripp (http://sqlskills.com/AboutKimberlyLTripp.asp).
Please note that, although these notes were taken during the class, I might have added some of my own (mis)interpretation :-). Always check your facts on Books Online (I try to provide links when applicable). As with anything else you get from a blog, never use any of this in production before you thoroughly validate it a test environment. Please keep in mind that some of those will be hard to follow without the right pre-requisite knowledge and the right context. Reading the post from top to bottom will help.
GUIDs as keys
Looking at the pages
Clustering key selection
You can read other posts on indexing on Kimberly's blog at http://sqlskills.com/BLOGS/KIMBERLY/category/Indexes.aspx