During installation you be asked a series of questions about which graphics files you want installed.  If you are a developer, you may want them all.  If not, you should just install the graphics for your particular machine, as some of the graphics files take up a lot of memory.  The supported machines are: Oregon Scientific Osaris, Diamond Mako, Ericsson MC218, Geofox One, Psion Revo, Revo Plus, Series 5, Series 5mx, netPad (in monochrome only), Series 7 and netBook.