Learn More About Column Statistics from Microsoft Whitepaper

I just ran across the whitepaper on MIcrosoft's website called "Statistics Used by the Query Optimizer in Microsoft SQL Server 2005" available at: http://www.microsoft.com/technet/prodtechnol/sql/2005/qrystats.mspx.
If you have every wondered about how statistics are used inside SQL Server, you should read this paper.