SQL Server 2005 Virtual Labs
The SQL 2005 Virtual labs, available for free on MSDN, are a great resource for learning about SQL Server 2005. Whilst everyone pretty much has a copy of SQL Server 2005 Developer Edition or Express Edition to learn on, not everyone has the time or resource to setup VM's with Office Server products to delve deeper into the BI capabilities of SQL Server 2005. With the virtual labs, everything is setup and ready to go, taking all the hassle out of setting up test environments.
SQL Server 2005 Virtual Labs on MSDN