I can't stress enough how important it is to the Mac dev community to be able to test their apps on this Developer Preview now, and not when 10.8 hits retail.
As of now running Mountain Lion as Host for Parallels doesn't work out-of-the-box, there is a very interessting thread on this over here: http://forum.parallels.com/showthread.php?t=257398
As a Guest OS ML installs and runs, Parallels Tools install, but the lack of 3D acceleration makes it unusable for some tests, this is an OS (like Lion) that relies heavily on GPU, using Launchpad is a joke without 3D accel., also the lack of proper mouse/trackpad support (no multitouch, no gestures, no lateral scrolling) is damaging.
Windows 8 preview was promptly supported as Guest, I expect the same for 10.8 preview.
Last edited: Feb 20, 2012