50btc.com - largest and one of the first mining pools in Bitcoin history Bitminter.com - has their own custom mining application and merged mining with NMC (Namecoin) P2Pool, P2Pmining.com To learn more about P2Pool, go to https://bitcointalk.org/index.php?topic=18313.0 Ozco.in - 1100GHashes, great pool, lasted since 2011