If you’ve been following the Xen movement, you might be interested in Sun’s announcement that Solaris can now operate as Dom0 (the controlling domain). To celebrate the availability of Dom0 support, the Solaris Xen community has written several in-depth technical posts:
Migrating Xen domains to new servers
Detailed description of how Xen handles page faults
The current Solaris Xen implementation is definitely not production quality, and is missing some key features such as hardware supported virtualization and network checksum offload. Dom0 support is definitely exciting news, and will hopefully spark some additional interest in Solaris.