A request directly from Microsoft crossed my desk about 10 minutes ago. They want more downloads of Windows 7 and Server 2008 R2 SP1 Beta. You should want it to, because in this update you’ll find Hyper-V’s much anticipated Dynamic Memory feature. Windows 7 and Server 2008 R2 both get RDS’s new RemoteFX, which improves the graphics experience across RDS sessions.
You can grab a copy of SP1 Beta here: http://technet.microsoft.com/en-us/evalcenter/ff183870.aspx?ITPID=wtcfeed.