If you have a few macs and want to make the most of networking them to share files and media, here are a few suggestions to get you started.

Firstly you’ll need to have a network setup.  if not you can get some help from apple support on Creating a small Ethernet network. Creating a small Ethernet network

Airport network is also an option but speed is compromised, if you must do netowrking via airport you can get the lowdown at apple docs – AirPort Base Station and Network Setup GuideAirPort Base Station and Network Setup Guide (Mac OS X 10.4 or earlier)

To get started sharing files you will need to Select folders to share, configure user groups and accounts so they can access the files, and choose a network type for your connection.  To get the full run down get over to apple support article Mac 101: File sharing Mac 101: File sharing

Now you want to share your itunes library from one central drive and backup to your time machine?  why not!  To start with you’ll need a fast network connection to stream your music across and ideally a ‘networked media server’.   To get the full run down on how to have your music on a networked drive accessible to all computers on the network, head over to Networked iTunes – macosx.com

If you simply want to Share iTunes Music on an existing Network With Mac OS X get the ehow here How to Share iTunes Music on a Network With Mac OS X | eHow.com

Happy mac netowrking
Scott