*Cough* Is X making your computer low? Perhaps moving away from the the "desktop environment" is your solution.

This could be a presentation about _tiling_ window mangers, particularly StumpWM, xmonad, and perhaps dwm if the presenter can take some time to learn it.

Will be a quick and dirty demo/presentation on how to use and customize these kinds of window mangers, their pros/cons, etc. Honourable mention could be make of Fluxbox and FVWM.