This website:
http://p2pool.in/ says, "By default, P2Pool receives 1% to fund P2Pool's development. This fee is optional, but very welcome and useful"
This website:
http://p2pool.org/ says, "Pool fee is 2%"
What is going on?
p2pool.org is just a person running a public p2pool node. They can set any fee they want. You should install p2pool yourself, or use a public scanner to find a public node with low latency to you.