Based on the success of the new sample databases installer we created for SQL Server 2008R2, we've created a new samples refresh (SR4) for SQL Server 2008 on CodePlex at http://msftdbprodsamples.codeplex.com/Release/ProjectReleases.aspx?ReleaseId=37109.  This is a much simpler and more robust installer which allows you to select the databases that can be successfully installed, and also provides advice when a database isn't available for installation.  Thanks for your feedback and for helping to create a vibrant SQL Server development community.