For those of you who still haven't seen these, Microsoft has VHDs (Virtual Hard Drives) that can be downloaded and used as a test enviroment.
2010 Information Worker Demonstration and Evaluation Virtual Machine (RTM)
This download contains a three Windows Server 2008 R2 SP1 Hyper-V Virtual Machine set for evaluating and demonstrating Office 2010, SharePoint 2010 and Project Server 2010.
The Virtual Machines contained in this package are 180 day evaluations.
Microsoft Office SharePoint Server 2007 VHD: (No longer available)
This fully functional pre-configured VHD provides you a trial software will automatically expire after 30 days.
Windows Server 2008 Hyper-V is required to use this virtual machine