Difficult to find for some reason or another...
I searched three or four times for it but couldn't find it. Finally found it on someone's site, so I thought I would direct you there to get it. It seems to have gone MIA over on Codeplex!
AdventureWorks 2008 Schema
http://www.wilsonmar.com/sql_adventureworks.htm
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Easy buddy - get the pic at the link.