Announced yesterday Oracle VM 3.0 can be downloaded from edelivery.oracle.com.
I have downloaded Oracle VM server - 177 M and Oracle VM Manager - 2.4 GB. As far as I remember Oracle VM Manager is based on Oracle Database and Weblogic stack and this explain a little bit size of iso image with VM manager.
Documentation can found here -Oracle VM 3.0 documentation.
ps. Going to install it now