I don't know where to find this in linux documentation... but there are a
number of default keyboard shortcuts for such things... go to preferences,
keyboard shortcuts, and look at what is there... there are many defaults
that are also disabled that you can create a custom shortcut for. Show
desktop is cntrl + alt + D in jaunty. there are also commands for minimize,
maximize, etc... cntrl + alt + up-arrow will tile all windows, superkey (the
windows key) + E will tile all workspaces (both require minumum effects to
be enabled in compiz, i think)... I learned those from a post on a blog
somewhere...