SharePoint Extranet
It has been out some time (since January 6th), but I know some of my clients are waiting for it. :-)
Overview
This document explains how to deploy SharePoint
Portal Server 2003 across an extranet. The white paper discusses how to
configure a SharePoint Portal Server deployment so that users outside an
external corporate firewall/proxy server can access information on a portal site
that is inside an external corporate firewall/proxy server. It specifically
discusses using Microsoft Internet Security and Acceleration (ISA) Server 2000
and ISA Server 2004 in what is generally considered to be a reverse proxy
configuration.