
If you want to know how it's done here is a very nice tutorial by Andrew Kator:
http://www.atpm.com/10.06/blender.shtml
Although you might want to change the -f command with -a for an animation

Now to get to the tricky part:
Somehow it seems like the nodes on the network stop rendering after a while, after reconnecting them they start rendering again, I'm still looking into this.
Next tuesday we have a little LAN party and will try to break the 5GHz barrier (5 macs, should be easy), and see if the speed really improves, I'll get back to this thread as soon as I have some news.