Learning Oracle VM Server (OVS)

I am learning about Oracle VM server. The whole documentation is here http://docs.oracle.com/cd/E50245_01/index.html
But first read http://docs.oracle.com/cd/E50245_01/E50249/html/index.html Introduction to Oracle Virtualization and http://docs.oracle.com/cd/E50245_01/E50250/html/index.html Oracle VM Manager documentation, it's really well written.
There is even a certification https://education.oracle.com/pls/web_prod-plq-dad/db_pages.getpage?page_id=654&get_params=p_id:127 with the usual brain dumps http://certifyguide.com/exam/1z0-590/
XEN has a really wonderful wiki, explaining what is Dom0 http://wiki.xen.org/wiki/Dom0

Great presentation (a bit outdated... 2011) of the product here here with Kurt Hackel