Re: post your rc.xml tweaks for openbox.
@anonymous - yes that is what I want. on my screen this means I can have four windows neatly arranged in separate "quadrants" (look at the x and y values). I don't use it much, but e.g. when writing statistics in R - I have gvim open on left halft of the screen (courtesy of your "w-left" keybinding (thanks)). Top right corner (w-KP_9) is graphics output, and bottom right (w-KP_3) is R console.
When I need to maximize a window I always just do alt+space+x
(p.s. the windows does in fact not always arrange neatly. I guess because decorations and scrollbars is added to the windows size? (two undecorated terminals does not touh with my settings - but two decorated firefox'es does. - a bit annoying)