The user registers an account, then is prompted to start mining. Mining is paid on a pay-per-share basis, with 3% taken by the pool operators. The site suggests that users invite their friends to mine with them, and allows users to embed java miners on their websites to create a Distributed Miner.
The UI provides features which seem to be exclusive to the site, such as a prediction of the time it will take to calculate one share.
This miner is a Cpu Miner