OVM 2.1.5 was released on ULN on June 10 2009. The updated documentation and the release notes are here:
http://download.oracle.com/docs/cd/E11081_01/welcome.html
The ISOs are available on eDelivery.
There is a new datasheet available here:
http://www.oracle.com/technologies/virtualization/docs/ovm-ds.pdf