Virtual Labs are a great way of getting your hands on a product - here is what is available for you at the moment:
§ 2007 Microsoft Office System
§ BizTalk Server
§ Branch Office
§ Enterprise Search
§ Exchange Server 2007
§ Forefront Security
§ Identity and Access (IDA)
§ Internet Information Services (IIS)
§ Microsoft Antigen
§ Microsoft Business Intelligence
§ Microsoft Identity Integration Server (MIIS) 2003
§ Microsoft Internet Security and Acceleration Server (ISA)
§ Microsoft Live Communications Server 2005
§ Microsoft Office Groove 2007
§ Microsoft Office SharePoint Server
§ Microsoft Operations Manager (MOM) 2005
§ Microsoft System Center
§ Microsoft Systems Management Server (SMS) 2003
§ Microsoft Windows Rights Management Services (RMS)
§ Secure Messaging and Collaboration
§ Security
§ SQL Server 2005 Upgrade
§ SQL Server 2005 Business Intelligence
§ SQL Server 2000
§ Windows Mobile
§ Windows PowerShell Scripting
§ Windows Server 2008
§ Windows Server 2003 & R2
§ Windows Vista
Enjoy!!!