ward@planktone.be:
Could it help when the nodes are running their own icecast server as I do ?
no. you'd multiply the possible problems: network / routing / bandwidth, OS-specific issues, software versions and configurations, etc. I can see a network of icecast or similar servers in failover and load-balanced configs one some horizon, but that most probably won't happen, someone would have to take care about it and pay the bill.
bests, udo