Xen 3.0.0 offers:

* Support for up to 32-way SMP guest operating systems
* Intel (Physical Addressing Extensions) PAE to support 32-bit servers with more than 4GB physical memory
* x86/64 support (Intel EM64T, AMD Opteron)
* Intel VT-x support to enable the running of unmodified guest operating systems (Windows XP/2003, Legacy Linux)
* Enhanced control tools
* Improved ACPI support
* AGP/DRM graphics

Xen 3.0 features greatly enhanced hardware support, configuration flexibility, usability and a larger complement of supported operating systems. This latest release takes Xen a step closer to being the definitive open source solution for virtualization.

The VT support is huge -- on a new enough CPU, you can run unmodified Windows/... in a Xen domain!