Kip Macy just sent an important email on the Xen Mailing List, annoncing nearly complete support for Xen 3.0 in FreeBSD CURRENT branch.
He’s also confident the complete Xen 3.0 x86 support will be ready for the FreeBSD 6.1 launch (expected after 20th March 2006) while the Xen 3.0 x64 support will be there with FreeBSD 6.2 (to be released after 31th July 2006).