UPDATE: Please go here to download the RTM version of the VHD
The SharePoint team just released a fully installed BETA SharePoint 2010 VHD file. This will same you a ton of time when you are setting up your development environment.
(NOTE this link is no longer valid see RTM link above)http://www.microsoft.com/downloads/details.aspx?FamilyID=0c51819b-3d40-435c-a103-a5481fe0a0d2&displaylang=en
The download contains 2 VHDs, 1 for SharePoint 2010 (and Office 2010) and 1 for Exchange 2010. Running both virtual machines will allow you to test out workflow and email scenarios with SharePoint and Office.
This is the same VHD that is used to complete the Hands On Labs in our SharePoint 2010 online training course.