Here are some of the links related to SQL Server 2005 on Windows Server 2008 Cluster:
Support WebCast: Microsoft SQL Server 2005 Failover Clustering on Windows Server 2008 - http://support.microsoft.com/default.aspx?scid=kb;EN-US;953170
Installing SQL Server 2005 on Windows Server 2008 - http://blogs.technet.com/seanearp/archive/2008/07/01/installing-sql-server-2005-on-windows-server-2008.aspx
SQL Server, Windows Server 2008, and the Windows Firewall - http://blogs.msdn.com/sqlsecurity/archive/2008/07/01/sql-server-and-the-windows-server-2008-firewall.aspx
Windows Server 2008 and SQL Server 2005 - http://blogs.technet.com/andrew/archive/2008/05/02/windows-server-2008-and-sql-server-2005.aspx
SQL Server 2005 Multi-Site Clustering with Windows Server 2008 - http://blogs.technet.com/rob/archive/2008/11/02/sql-server-2005-multi-site-clustering-with-windows-server-2008.aspx
How to migrate SQL Server 2005 Service Pack 2 failover clustered instances from Windows Server 2003 Service Pack 2 to Windows Server 2008 - http://support.microsoft.com/default.aspx?scid=kb;EN-US;953200- Win2008 Cluster Webcasts - http://social.technet.microsoft.com/forums/en-US/winserverClustering/thread/727eebda-0e31-4fa4-b9e0-881323f91b9b
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