One more feature I forgot to mention (and perhaps one of the most popular pekwm features) is the AutoProps... This is a very robust feature that allows you to specify all sorts of properties for a window to have on launch (Being grouped with other windows, size, position, which desktop, whether it has a border/titlebar, sticky, etc).
> Aww.. no fluxbox ?
> Its window tabbing feature is a
If you like Fluxbox, You should take a look at Pekwm (http://pekwm.pekdon.net/). It's got a window grouping feature similar to fluxbox tabs, A lightweight pixmap theme engine (which ends up meaning that the themes look good, and still end up rendering faster than Fluxbox), and generally a bit faster. (Yes, it still has dockapp support, It's called the 'harbour' under pekwm.)