When you mess around with Migration Assistant, you can choose to only move certain things like an iTunes library or your Mail? You don't have to do everything do you?
Weird... the Mac Pro isn't seeing the G5 even though I'm sharing folders between the two. The Migration Assistant doesnt see the G5. I might hooking an ethernet cable up between the two. For some reason, the Mac Pro came with 2 ethernet ports. I found that odd.