If you want to try SharePoint 2010 without the hassle of installing and configuring it with over 200 demo accounts, you can now download a preconfigured Hyper-V VM from Microsoft: http://www.microsoft.com/downloads/details.aspx?FamilyID=0c51819b-3d40-435c-a103-a5481fe0a0d2&displaylang=en

2 VMs are available for download.

Machine “a” contains the following:

1. Windows Server 2008 SP2 Standard Edition x64, running as an Active Directory Domain Controller for the “CONTOSO.COM” domain with DNS and WINS
2. Microsoft SQL Server 2008 SP2 Enterprise Edition with Analysis, Notification, and Reporting Services
3. Microsoft Office Communication Server 2007 R2
4. Visual Studio 2010 Beta 2 Ultimate Edition
5. Microsoft SharePoint Server 2010 Enterprise Edition Beta 2
6. Microsoft Office Web Applications Beta 2
7. FAST Search for SharePoint 2010 Beta 2
8. Microsoft Project Server 2010 Beta 2
9. Microsoft Office 2010 Beta 2
10. Microsoft Office Communicator 2007 R2

Machine “b” contains the following:

1. Windows Server 2008 R2 Standard Evaluation Edition x64, joined to the “CONTOSO.COM” domain
2. Microsoft Exchange Server 2010

Update:
If you need the administrator password, it is “pass@word1”