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Eta Car, with its historical outbursts, visible ejecta and massive, variablewinds, continues to challenge both observers and modelers. In just the pastfive years over 100 papers have been published on this fascinating object. Wenow know it to be a massive binary system with a 5.54-year period. In January2009, Eta Car underwent one of its periodic low-states, associated withperiastron passage of the two massive stars. This event was monitored by anintensive multi-wavelength campaign ranging from gamma-rays to radio. A largeamount of data was collected to test a number of evolving models including 3-Dmodels of the massive interacting winds. August 2009 was an excellent time forobservers and theorists to come together and review the accumulated studies, ashave occurred in four meetings since 1998 devoted to Eta Car. Indeed, Eta Carbehaved both predictably and unpredictably during this most recent periastron,spurring timely discussions. Coincidently, WR140 also passed through periastronin early 2009. It, too, is a intensively studied massive interacting binary.Comparison of its properties, as well as the properties of other massive stars,with those of Eta Car is very instructive. These well-known examples of evolvedmassive binary systems provide many clues as to the fate of the most massivestars. What are the effects of the interacting winds, of individual stellarrotation, and of the circumstellar material on what we see ashypernovae/supernovae? We hope to learn.

Eta Carinae in the Context of the Most Massive Stars