Create new Place
Choose File > New Place or Command-Option-N
Select folder(s) and choose Selection > Display as Place
Drag a folder or volume (eg. external drive, server share) from Finder onto the Raskin Surface or the Raskin Dock symbol. (Works for any folder that hasn't been displayed on the Surface before.)
Drag the Places title bar to arrange Places on the Surface.
Pull on the white bars at top right of Place to resize.
Choose Edit > Rename Place
Hide Places you don't use temporariliy or permanently from the Surface. Once you need them again, just drag them from Finder onto the Raskin Surface. Raskin will remember your earlier arrangements as far as possible.
Choose Hide Place from the View menu or from the shortcut menu.