TightVNC..
also not mentioned yet ,but if your just after by far the fastest 100Mbit/1gigabit remote network attached storage for a single windows machine, ISCSI is the thing to use as it runs at virtually full wirespeed.
the ISCSI mounted drives just appear to be local drives to the connected windows XP PC
one drive or software-Raid per machine and a copy of FreeNas should start you in the right direction.
see my other ISCSI /FreeNas posts
http://www.cableforum.co.uk/board/se...archid=2317258