i wrote a perl script about a year ago called qconsole that used wmctrl to incrementally scroll an xterm down from the top of my screen, then back up when it was called again. i called it qconsole because i thought i remembered the game quake having a console like that. even though i have lots of xterms scattered around my screens all the time, having that one console around in whatever workspace i was in, accessible with a single keystroke, was really handy.
when i switched from fluxbox to xfce4/xfwm, it no longer worked because xfwm won't allow windows to be moved off-screen even a window's mapping geometry is specifically requesting it. that sucked, and i stopped using qconsole.