Source:
https://github.com/narken/p2pool-altcoinsNodes currently online: 204.10.105.113 (p2pool.org), 78.27.191.182 (not a public node, i.e. you can't point workers here)
Connect to the nodes with -n command line option.
EDIT. To work properly and connect to the nodes, launch with
./run_p2pool.py -n 204.10.105.113 -n 78.27.191.182 --net mincoin --bitcoind-rpc-port=9335 --bitcoind-p2p-port=9334 <rest of your p2pool options>