How can I go about networking my PC to my MAC so I can capture on the PC and move the files over to the mac? I have XP and Leopard.

May I ask why you want to capture on one and edit on the other? The fastest way is probably to hook a firewire cable between the PC and Mac and use Target Disk Mode. Turn off the Mac and hold the T key while starting up. The Mac's hard drive will show up on the PC.

A standard Ethernet home network.

You'll just need a couple of standard Ethernet cables and a cheap hub.

Another option would be an external hard drive with USB 2 or firewire connections.