If you decide you no longer need WON and would like to get its icon off your Desktop, enter WONSetup and uncheck all of the options. When you restart your machine, WON will no longer be visible.
If this does not work for some reason, edit /boot/beos/system/boot/Netscript and comment out the following lines:

start  beos/bin/ksocketd
start beos/system/servers/da_hood

The first method should work fine, but hey, WON is still experimental….