The AdventureWorks sample databases for SQL Server 2008R2 have been updated and are available at http://msftdbprodsamples.codeplex.com/Release/ProjectReleases.aspx?ReleaseId=24854.  This version includes both the AdventureWorks 2008R2 schema and data, and the original AdventureWorks schema and data which shipped with SQL Server 2005.  With this one installation package you get the databases you'll need to run most samples, and also the databases you can use to explore the new features in SQL Server 2008.  Several bugs have been fixed including one community submitted one.  The installer now functions better when there are multiple instances of SQL Server with different SQL Server versions.  Please try the latest installer out and let us know what you think on the Community Sample forums at http://social.msdn.microsoft.com/Forums/en-us/sqlserversamples/.  Thanks!

 --Bonnie