Quoting from official Xen-announce mailing list:
The Xen team are pleased to announce the release of Xen 2.0.6 !
This release includes support for Linux versions 188.8.131.52 and 2.4.30, NetBSD 2.0 and FreeBSD 5.3, along with many bug fixes. In particular:
* a fix to a nasty VM relocation bug
* several AGP/DRM fixes
* block device performance fix
* CDROM and floppy fixes
* better hyperthreading support
* misc tool hardening and improved default security
The announcement also anticipates 3.0 release:
Early in June we will be releasing the 3.0-testing series, which is the first step toward the 3.0.0 release. There are a number of important architectural changes in the 3.0 development tree, and we’ll be creating the testing series as soon as 32 bit x86 (8GB support will not have the same level of maturity, but hopefully this will be achieved through extensive testing and continuing development over the coming weeks.