Hot off of the presses comes a release announcement marking the final release of Xfce 4.6!
from Stephan Arts <stephan@xfce.org>
date Thu, Feb 26, 2009 at 6:30 PM
subject Xfce 4.6.0 Released!!!After more than two years of development, Xfce 4.6.0 has just been released.
Xfce 4.6 features a new configuration backend, a new settings manager,
a brand new session manager and sound mixer as well as several huge
improvements of its core components. A list of all the changes since
the last release candidate can be found on this page.A visual overview of Xfce 4.6 is available here:
http://www.xfce.org/about/tourDownload Xfce 4.6 from the Downloads section of the Xfce website:
http://www.xfce.org/downloadRegards,
The Xfce development team.
All interested parties should take a quick peek at the desktop tour that is linked-to above, but Xubuntu users won’t need to download anything from the Xfce website – Xfce 4.6 will be included by default in Xubuntu 9.04. 
CONGRATULATIONS to the entire Xfce development team!
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[...] In an email, release manager Stephan Arts announced the new version 4.6 (only even numbers are used for stable releases), which has already been picked up in various articles all over the web. [...]