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The Microsoft Official site URL is http://www.microsoft.com/sqlserver/2008/en/us/default.aspx 
Test Drive Windows Server 2008 Try out Windows Server 2008 instantly by simply logging onto our test-drive environment using your Web browser and experience Windows Server 2008 first hand. 
Windows Server 2008 "How-to" Videos Tune in for these short (5-10 minute) videos by Microsoft IT Pro Evangelists demonstrating different features of Windows Server 2008.
MSDN setup help page from Server Core install point.
Download the New Microsoft Assessment and Planning Tool and Get Started with Server Migration Projects With the new Microsoft Assessment and Planning tool, you have the ability to conduct network-wide assessment and determine readiness for migration to Windows Server 2008, Windows Server Virtualization, Microsoft Application Virtualization, Terminal Services, and Microsoft System Center Virtual Machine Manager.
Virtual Lab: What's New in SQL Server 2008 for Database Administrators In this hands-on-lab, you will work with the new date data type, implement a Declarative Management Framework (DMF) policy and look at new features added to database mirroring. You will also implement and work with table valued parameters and look at database changes using change data capture (CDC).
Virtual Lab: Administering Servers by Using Declarative Management Framework Policies Declarative Management Framework is a policy-based system for managing one or more instances of Microsoft SQL Server 2008. In this hands-on-lab you will implement a DMF policy and implement that on the server level, including filtering.

Working with the New DATE Data Type in SQL Server 2008 SQL Server 2008 supports several new data types. In this hands-on-lab, you will compare the new DATE/TIME data types to the SQL Server 2005 data types and implement the new data types in table definitions and T-SQL batches.