When it starts its operation in 2009, the Large Hadron Collider will be the highest energy particle collider ever reconstructed. With the center-of-mass energy of 10-14TeV, it will provide a window to the TeV scale, a domain where the source of electroweak symmetry breaking should manifest. Many exotic new particles are expected to be produced copiously, based on generic arguments such as partial wave unitarity, or radiative corrections to the Higgs Boson mass. ATLAS is one of the two general-purpose detectors to search for these particles. It has recently gone through a full comissioning exercise using cosmic muons and was shown to be ready for first collisions. This talk will summarize the current status of the detector and then focus on a few select physics signatures and finally show how phenomenological constraints and analysis techniques connect various physics topics together.