The popular virtualization vendor Parallels in the race to update its product for Apple MacPro hardware, surprisingly added support for the most expected upcoming operating systems: Apple Mac OS X 10.5 (codename Leopard) and Microsoft Windows Vista.
In the just published Release Candidate build the product only supports Leopard developer build and Vista beta 2, but extended support for newer builds is planned.
The new build also supports OpenBSD 3.8.
Download it here.