From Distrowatch "Hybryde Linux is an Ubuntu-based distribution for the desktop. Its most unusual feature is an option to switch rapidly between multiple desktop environments and window manager without logging out - the list includes Enlightenment 17, GNOME 3 (GNOME Shell and GNOME 3 "Fallback" mode), KDE, LXDE, Openbox, Unity, Xfce and FVWM. This is achieved via a highly customisable Hy-menu, which also allows launching applications and configuring the system. All open applications are carried to any of the available desktops. The system offers an interesting way to work fluidly in a multi-desktop environment."
Home page: http://www.hybryde.org/
I downloaded from the link at Distowatch here http://distrowatch.com/ then I booted in to the live DVD and was very impressed with the ease of switching desktop environments without having to log out and back in.
May be of interest?
Edited by 1002 Richard S, 17 May 2012 - 12:23 AM.