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!