You won't be able to stream things to you 360 from the older Xboxes, that much I know for sure.
I haven't tried to network my 360 at all, but from what I've read, it will only stream/connect with PCs running XP Media Center and possibly Vista. There are also a few other programs that unofficially allow you to stream, but I can't remember the names off hand (tversity maybe??)
Basically, the original Xbox is much more useful as a networked media device than a 360 (for now). Is that what you are trying to do? You have a pretty vague description of "networking" them together. What exactly are you aiming for?