I havent kept up with P2pool for so long. Way back when i tried it with GPUs more than a year ago, its very resource hungry and variances were so high.
Still resource hungry, still high variance.
I was really keen to use P2Pool, and ran it for several months, but to be honest it was just too much - it needed a fast machine to run it, and payouts were pretty woeful. Half of any mining profits (if I got any at all) was wasted on power to run the i3 machine needed to make P2Pool perform anywhere near well enough. I tried to run it on a Sempron dual core 2.5GHz CPU, and it struggled with a measly 5GH/s. Someone said they ran P2Pool on a Celeron 847, but I think they were huffing glue.
Now I'm up to 35GH/s, I gave up on P2Pool. I get far better returns with less bother on a 'real' pool.