Augur crowdsale account holders have until September 12 to confirm the ETH address at which to receive the Reputation (REP) tokens they purchased.
Possession of REP will make you an Augur reporter. When Augur goes live, reporters will become responsible for accurately voting on the platform's prediction market outcomes in return for a percentage of all trading fees generated by all markets on the system.
Augur aims to go live later this year. More details, including updates, can be found here.