The ATLAS experiment took its first beam data in September 2008 and is
actively preparing for the planned start of LHC collision data-taking in 2009.
This preparation includes hardware and software commissioning, as well as
calibration and cosmic data analysis. The status and performance of the ATLAS
detector will be discussed, with a view towards the Pb+Pb run expected in 2010.Comment: 8 pages, 14 figures, corrected typos, added references, figures
corrected for better legibility in B&W - To appear in the conference
proceedings for Quark Matter 2009, March 30 - April 4, Knoxville, Tennesse