Is it possible to switch between GNOME/Beryl and Blackbox without rebooting, I know I asked you people if I should use KDE or GNOME but I saw a screenshot of GNOME with Beryl imitating the Windows Aero interface and was beautiful and a beautiful screenshot of Blackbox and I want to use both by switching back and forth, without rebooting, so is it possible?
Just log out, and then when you log in choose a different window manager.
Alternatively you can prob run them both at the same time on different ttys... ctrl-alt-f7 will get you to your current wm, ctrl-alt-f1 or f2, f3 etc will get you to other ttys, maybe just running blackbox in one of those will get them both running at the same time...
but you can't run 2 window managers at the same time (Beryl is a window manager which is a fork of Compiz).
The point of running Beryl and GNOME together is because you get special effects while moving the windows and Beryl can act as the equivalent of Windowsblinds.