The Hyper-V image is now available publically here
. It is 15 x 700Mb files...so make sure you've got the bandwidth 
The benefit here is that everything is setup for you and you can run through the development hands on labs on MSDN.
Tips & Tricks
There is a new wiki page started that includes info on how to get the VM running in VMWare and Virtual Sun Box. Also some tips on what you can do with the VM. See Microsoft SharePoint 2010 Demo VM Tips & Tricks.
