After a long development phase Xen reaches state 3.1 (previously labelled as 3.0.5) and gains some interesting features:

• XenAPI (providing support for virtual lab management capabilities and configuration metadata)
• Dynamic memory control for non-paravirtualized virtual machines (Windows)
• Support for basic save/restore/migrate operations for non-paravirtualized virtual machines (Windows)
• Support for 32bit paravirtualized guests
• Support for virtual disks on raw partitions

Download it as source, binary tarballs or RPMs.

From now on expect a new release of XenEnterprise and Virtual Iron platforms based on the new engine release.