A mining pool server which offers shared block payouts. This pool gives you the most statistics and believes in keeping everything as transparent as possible. This pool also shows you the efficiency of your bitcoin miner, which is very unique. The pool operates on the fact that more efficient miners reduce the amount of resources used by server, and with fewer resources being wasted, the server can handle a very large number of users.
Only shares from the current block in the current round are accepted.
The pool operators also released poclbm-mod which is a modified version of m0mchil's poclbm miner that is 5x more efficient. What this means is that poclbm-mod searches through the entire work it receives from the server before asking for more work, which reduces the amount of wasted resources. Currently, no other miners are as efficient as poclbm-mod.
The service was first available for Beta testing starting March 08, 2011.