Status of the ATLAS Experiment and Early Physics Measurements

The ATLAS experiment has collected several hundred million cosmic ray events during 2008 and 2009 providing the primary source for commissioning the detectors, trigger, data acquisition and event reconstruction programs. The data allowed studying the performance of all detector components. Results on performance and readiness of the sub-detectors will be reported. We will also outline the potential for early physics measurements during the first year of operation.