This is easily the best BTC Mining Pool one can be a part of.
http://cur.lv/5fkfq
I've been a member of this pool since 2012 and I am very, very happy.
The pool works in the following manner: You deposit BTC, your BTC buys you hashing power and a share of the pool. You earn your deposit + 10% with bonuses for any referrals you make.
This is a working mining pool that PAYS. You can look them up on the Bitcointalk.org forums for proof!