We may buy a condo which is still under construction.
Before we buy it, I may have them install cat5e ethernet beteween the
living room and two bedrooms.  Does anyone know of a site which has
suggestions for the port/cabling configurations?

I have two separate networks, each with their own separate internet
connections and gateways.  Each of these networks consists of PC's on a
variety of platforms networked using SMB.  Between the two machines I
have a multi-homed Win 2003 server.