IIS is workin corrrently if ya can put the computer name on the IE addressline and your home page pops up. It will do the same it when using its Lan IP.
IIS sounds setup oka nd good to go on the XP box.
Now to access it from the WAN, externally, Port Forwarding on the router will have to be set up to send external(Wan) requests to that particluar XP box on in Internal Lan... Read your router doc for port forwarding and forward port 80(http) and port 21(ftp) to the xp box's Lan IP - and then your on the WAN!!!
That's about it!
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