There are a handful of public P2Pool
nodes open for people to point their miners to. No need to run P2Pool
yourself, and coins generated will generate directly into your wallet. Check with the exchanges first to see if they can take generated transactions for deposit directly, some can, some can't.
I don't believe P2Pmining.com
sends generated coins directly, but sends normal transactions for payouts, so sending direct to an exchange shouldn't be a problem. They also merge-mine. I have not used P2Pmining.com
myself, however, so I may be mistaken on a detail or two for them.
The public P2Pool Server List
operates as PPLNS
, and has a BTC and an LTC network.