I saw that someone over on ActiveWin posted a concern that CTP users weren't able to get the new Additions that we've posted over on Connect.
The truth is, anyone can get the new Additions, even if you aren't currently a member of Connect. To get them, follow these steps:
Also, you don't need to have the Virtual Server 2005 R2 SP1 beta to use these Additions. They work on Virtual Server 2005 R2 and Virtual PC 2004 SP1 (and possibly on older versions of the software as well... I don't know, I haven't tried).